Crown Stereo Amplifier 460CSL User Manual
POWER AMPLIFIER  
SERVICE MANUAL  
®
™
POWER BASE-1 & 460CSL  
©1995 by CROWN INTERNATIONAL, INC.  
MailingAddress:  
P.O. Box 1000  
ShippingAddress:  
57620 C.R. 105  
Elkhart, IN U.S.A. 46515-1000  
Elkhart, IN U.S.A. 46517  
CSL™ is a trademark and Power Base-1,® ODEP® and Crown® are registered trademarks of Crown International, Inc.  
K-SVCPB1  
1-95  
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Power Base-1 & 460CSL Amplifier Service Manual  
Table of Contents  
Introduction ............................................................. 4  
Scope ...................................................................... 4  
Warranty .................................................................. 4  
Parts ........................................................................ 5  
Specifications .......................................................... 6  
Voltage Conversion ................................................. 7  
Circuit Theory .......................................................... 8  
Test Procedures .................................................... 13  
Mechanical Parts Listing ....................................... 17  
Module Information ............................................... 20  
Q42576-1 Output Module (Original) ..................... 21  
Q42661-1 Output Module (#2) .............................. 22  
Q42718-9 Output Module (#3) .............................. 23  
Q42885-6 Output Module (TO-3P) ........................ 24  
Q42967-2 Output Module (THC) ........................... 25  
Q43200-7 Output Module (THC #2) ...................... 26  
Q42552A0 Main Module (Original)........................ 27  
Q42664-5 Main Module (Service Only) ................. 29  
Q42682-7 Main Module (#2) ................................. 31  
Q42776-7 Main Module (3rd Gain) ....................... 34  
Q42953-2 Main Module (3rd Gain PB-1) .............. 37  
Q43060-5 Main Module (THC) .............................. 40  
3
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Power Base-1 & 460CSL Amplifier Service Manual  
Introduction  
This manual contains service information on Crown  
Each of the compact audio power amplifiers are  
designed for professional or commercial use. Provid-  
ing high power amplification from 20Hz to 20KHz with  
minimum distortion, they feature balanced inputs with  
bridged and parallel monophonic capability. Specific  
features vary depending on model family.  
poweramplifiers. Itisdesigned tobeused inconjunc-  
tion with the applicable Owner's Manual. However,  
some important information is duplicated in this Ser-  
vice Manual in case the Owner's Manual is not readily  
available.  
NOTE: THE INFORMATION IN THIS MANUAL IS INTENDED  
FOR USE BY AN EXPERIENCED TECHNICIAN ONLY!  
WARRANTY  
Each Owner's Manual contains basic policies as re-  
lated to the customer. In addition it should be stated  
that this service documentation is meant to be used  
only by properly trained service personnel. Because  
most Crown products carry a 3 Year Full Warranty  
(including round trip shipping withintheUnited States),  
all warranty service should be referred to the Crown  
Factory or Authorized Warranty Service Center. See  
theapplicableOwner’sManualforwarrantydetails.To  
find the location of the nearest Authorized Service  
Center or obtain instructions for receiving Crown Fac-  
tory Service please contact the Crown Technical Sup-  
port Group (within North America) or your Crown/  
Amcron Importer (outside North America).  
SCOPE  
This Service Manual includes several sections. These  
sections include Parts Ordering, Specifications, Volt-  
age Conversion, Circuit Theory, Factory Test Proce-  
dures, MechanicalPartsLists, and ModulePartsLists.  
Schematics are attached. Note that component parts  
with circuit board comprise a complete module. Mod-  
ule part numbers are always associated with a spe-  
cific circuit board, although an unpopulated circuit  
board may be built up with different parts to create  
different modules. Note that Crown does not sell blank  
(unpopulated) circuit boards.  
Crown  
Technical Support Group  
Factory Service  
Parts Department  
Mailing Address:  
PO Box 1000  
Elkhart, IN USA 46515-1000  
Shipping Address:  
57620 C.R. 105  
Elkhart, IN USA 46517  
Phone: (219) 294-8200  
Toll Free: (800) 342-6939  
FAX: (219) 294-8301  
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Power Base-1 & 460CSL Amplifier Service Manual  
Parts  
shipment on a C.O.D. or pre-payment (check or credit  
card) basis.  
GENERAL INFORMATION  
Later sections include both mechanical and electrical  
parts lists for this product. The parts listed are current  
as of the date printed. Crown reserves the right to  
modify and improve its products for the benefit of its  
customers.  
TERMS  
Normal terms are pre-paid. Net-30 Days applies to  
only those firms having pre-established accounts with  
Crown. If pre-paying, the order must be packed and  
weighed before a total bill can be established, after  
which an amount due will be issued and shipment  
made upon receipt of pre-payment. New parts re-  
turned for credit are subject to a 10% re-stocking fee,  
and authorization from the Crown Parts Department  
must be obtained before returning parts for credit.  
PART NUMBERING SYSTEMS  
As of the printing of this manual, Crown is using two  
numbering systems. The elder system always uses  
eight characters. The first character is a letter. Com-  
mon letters used are C, D, H, M, P, and Q. The second  
through sixth characters are numbers. The numbers  
build sequentially (for each prefix letter) as new parts  
are added to our parts inventory system. (In some  
cases there will be a space then a four character  
number after the prefix letter; the space is considered  
a character.) The seventh character is usually a hy-  
phen, though it may be a letter to indicate a revision or  
specialnote.Thelastcharacteriscalled acheck-digit,  
and is useful to Crown for internal tracking.  
Crown is not a general parts warehouse. Parts sold by  
the Crown Parts Department are solely for servicing  
Crown/Amcron products. Part prices and availabil-  
ity are subject to change without notice.  
Crown is in the process of converting to a new part  
number system. Length may vary from eight to twelve  
characters. There is still a letter prefix, then five  
numbers. These five numbers identify a type of part.  
The seventh character is a hyphen. Remaining char-  
acters identify the details of the type of part identified  
by the first part of the number.  
Crown  
Parts Department  
STANDARD AND SPECIAL PARTS  
Mailing Address:  
PO Box 1000  
Elkhart, IN USA 46515-1000  
Many smaller electrical and electronic parts used by  
Crown are stocked by and available from electronic  
supply houses. However, some electronic parts that  
appear to be standard are actually special. A part  
ordered from Crown will assure an acceptable re-  
placement. Structural items such as modules and  
panels are available from Crown only.  
Shipping Address:  
57620 C.R. 105  
Elkhart, IN USA 46517  
Phone: (219) 294-8210  
or: (219) 294-8211  
Toll Free: (800) 342-6939  
FAX: (219) 294-8301  
ORDERING PARTS  
When ordering parts, be sure to give the product  
model, and include a description and part number  
(CPN/DPN) from the parts listing. Price quotes are  
available on request.  
SHIPMENT  
Shipment will be normally made by UPS or best other  
method unless you specify otherwise. Shipments are  
made to and from Elkhart, Indiana USA, only. Estab-  
lished accounts with Crown will receive shipment  
freight prepaid and will be billed. All others will receive  
5
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Power Base-1 & 460CSL Amplifier Service Manual  
Specifications  
Unless noted otherwise, all specifications are based  
Input Impedance: Nominally 20K ohms balanced; 10K  
on driving an 8 ohm load per channel, both channels  
driven, the sensitivity switch in the 26dB position, the  
AC supply is 120VAC at 60Hz. Crown specifications  
are guaranteed through the warranty period (normally  
3 years). Because our testing methods are more strin-  
gent than our published specifications, every Crown  
amplifier will exceed its published specifications.  
ohms unbalanced.  
Output Impedance: <10 milliohms in series with <2  
microhenries.  
Protection Systems: Output Device Emulation Protec-  
tion (ODEP) limits drive in the event of dangerous  
dynamic thermalconditionswithoutinterrupting power.  
Currentlimiting forshorted load protection.DC/LFand  
common mode output current Fault circuitry to mute  
audio. Delayof4secondsfromturnonmutesamplifier  
to prevent dangerous turn-on transients. High voltage  
fuse in main transformer primary and low voltage fuse  
in fan primary. Slew rate limiting to prevent RF burn  
out.  
POWER  
Power  
8 Ohm Stereo—205W/Ch  
4 Ohm Stereo—230W/Ch  
8 Ohm Bridge Mono—430W  
4 Ohm Parallel Mono—425W  
Load Impedances: Rated for 16, 8, 4, and 2 (parallel  
monoonly)Ohmoperation;safewithalltypesofloads,  
even totally reactive loads.  
MECHANICAL  
Input Connectors: Balanced 1/4 inch phone jacks.  
AC Mains: 120VAC at 60 Hz with standard 3 wire  
grounded 15A connector with single voltage trans-  
former and fan for North American units; 100VAC,  
120VAC, 220VAC, and 240VAC at 50 or 60 Hz when  
equipped with universal transformer, applicable fan,  
and other applicable hardware with country specific  
power cord. Note that at 50 Hz fan speed is reduced.  
Output Connectors: Color-coded 5-way binding posts  
on 3/4 inch centers; spaced 3/4 inch apart.  
Front Panel Controls: A rocker on/off power switch.  
Back Panel Controls: A three-position switch which  
selects Stereo, Bridge-Mono, or Parallel-Mono mode;  
a two position input ground-lift switch, and level con-  
trols for each channel.  
PERFORMANCE  
Frequency Response: ±0.1dB from 20 Hz to 20 kHz at 1  
Internal Controls:Athree-positionswitchselects0.775V,  
1.4V, or 26 dB voltage gain input sensitivity (all units  
manufactured with D 7911-7 main module or later;  
earlier models only allowed for 0.775V or 26 dB gain).  
Watt.  
Phase Response: ±10° from 10 Hz to 20 kHz at 1 Watt.  
Signal to Noise Ratio: Better than 105 dB (A-weighted)  
below max. average power from 20 Hz to 20 kHz.  
Indicators: Red Enable indicator shows on/off status of  
low-voltage power supply.  
Total Harmonic Distortion (THD): <0.05% from 20 Hz to  
1 kHz, increasing linearly to 0.1% at 20 kHz at 170W.  
Construction: Black splatter-coat steel chassis with  
specially designed flow-through ventilation system.  
I.M. Distortion:<0.05%from10milliwattsto170Wat26  
dB gain.  
Mounting: Standard EIA 310 front-panel rack mount  
with supports for supplemental rear corner mounting.  
Slew Rate: >13V per microsecond.  
Damping Factor: >1000 from 10 Hz to 400 Hz.  
DC Offset: <10 millivolts.  
Dimensions:19incheswide, 3.5incheshigh, 16inches  
deep behind front mounting surface.  
Weight: 30 lbs.  
6
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Power Base-1 & 460CSL Amplifier Service Manual  
Voltage Conversion  
PB/CSL Universal Fuse Board  
P16  
P6  
P5  
P10  
100V Connections:  
P10 to P15  
P15  
P14  
P11 to P14  
P7 to P12  
P4  
120V Connections:  
P10 to P16  
P11 to P14  
P9  
P8  
P7 to P13  
P13  
P12  
P3  
P2  
220V Connections:  
P10 to P15  
P9 to P14  
P7  
P8 to P13  
P19  
P20  
BLU  
BRN  
240V Connections:  
P10 to P16  
P9 to P14  
P11  
P1  
P8 to P13  
For list of applicable  
transformer, fuse F100,  
fanformer, and power  
cord refer to voltage-  
parts cross-reference.  
P22  
P21  
F100  
P18  
F1  
Specific parts are required for the PB-1/460CSL in  
order to be used at different international line volt-  
ages. Refer also to Mechanical Parts Lists.  
P17  
100V AC Mains:  
10A Fuse  
A10285-26  
A10285-7  
D 7598-2  
H43055-5  
0.5A Low Voltage Supply Fuse  
Power Transformer (Universal)  
Transmotor 120V 50 Hz  
S1 Power Switch  
120V AC Mains:  
10A Fuse  
A10285-26  
A10285-7  
D 7598-2  
D 6589-2  
H43055-5  
H43065-4  
0.5A Low Voltage Supply Fuse  
Power Transformer (Universal)  
Power Transformer (United States)  
Transmotor 120V 50 Hz  
Transmotor 120V 60 Hz  
Note: The only versions of this  
product produced at the Crown  
Factory with international volt-  
age capabilities built in are CSL  
versions built specifically for  
sale outside the United States.  
220V to 240V AC Mains:  
5A Fuse  
A10285-21  
A10285-7  
D 7598-2  
H43055-5  
0.5A Low Voltage Supply Fuse  
Power Transformer  
Transmotor 120V 50 Hz  
7
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Power Base-1 & 460CSL Amplifier Service Manual  
Theory  
clude a single core transformer (one primary with two  
OVERVIEW  
independent ungrounded secondaries), a full time full  
speed fan which also serves as the low voltage  
transformer, slew rate limiting, and audio muting for  
delay or protective action. This amplifier can operate  
in either a Bridged or Parallel Mono mode as well as  
dual (stereo). A sensitivity switch allows selection of  
input voltage required for rated output. Level controls  
are rear mounted. The only indicator provided tells the  
operator that the low voltage supply is energized. In  
general, the packaging of this model is designed for  
maximum watt/price/weight/size value. It is the most  
basic grounded bridge amplifier now available from  
Crown.  
It should be noted from the outset that the PB-1 and  
460CSL amplifiers are electrically and mechanically  
identical products. The only differences, from a ser-  
vice perspective, are cosmetic. For the purposes of  
servicing the products, it should also be known that  
the CSL version has been on the market since 1992.  
Since the PB amplifiers have been in production since  
the mid-1980’s there are a number of electrical and  
mechanicalpartsassociated withtheolderPBmodels  
only. It is also important to realize that over time Crown  
has introduced numerous improvements to PB/CSL  
amplifiers. Though often changes are minor, and are  
madeforavarietyofreasons, afewchangeshavehad  
a significant impact on the operation of the circuitry.  
This manual is up to date as of the time of writing. For  
additional information regarding these amplifiers, re-  
fer to the applicable Technical Notes provided by  
Crown for this product.  
For additional details refer to the specification section,  
or to the applicable Owner’s Manual.  
FRONT END OPERATION  
The front end is comprised of three stages: Balanced  
Gain Stage (BGS), Variable Gain Stage (VGS), and  
the Error Amp. Figure 1 shows a simplified diagram of  
a typical front end with voltage amplification stages.  
This section of the manual explains the general opera-  
tion of a typical Crown power amplifier. Topics cov-  
ered include Front End, Grounded Bridge, and ODEP.  
Due to variations in design from vintage to vintage  
(and similarities with other products Crown) the theory  
of operation remains simplified.  
Balanced Gain Stage (BGS)  
Input to the amplifier is balanced. The shield may be  
isolated from chassis ground by an RC network to  
interrupt ground loops (early models did not have the  
Ground Lift feature) via the Ground Lift Switch. The  
non-inverting (hot) side of the balanced input is fed to  
the non-inverting input of the first op-amp stage. The  
inverting (negative) side of the balanced input is fed  
to the inverting input of the first op-amp stage. A  
potentiometer is provided for common mode rejection  
adjustment. Electrically, the BGS is at unity gain.  
(From an audio perspective, however, this stage  
actually provides +6dB gain if a fully balanced signal  
is placed on its input.) The BGS is a non-inverting  
stage. It’s output is delivered to the Variable Gain  
Stage.  
FEATURES  
Power Base/CSL amplifiers utilize numerous Crown  
innovations including grounded bridge and ODEP  
technologies. Cooling techniques make use of the  
whatisessentiallyairconditionertechnology. Airflows  
bottom to top, and front to side. Air flows a short  
distance across a wide heatsink. This type of air flow  
provides significantly better cooling than the “wind  
tunnel” technology used by many other manufactur-  
ers. Output transistors are of the metal can type rather  
than plastic case. This allows for a significantly higher  
thermal margin for the given voltage and current  
ratings. All devices used are tested and graded to  
ensure maximum reliability. Another electronic tech-  
nique used is negative feedback. Almost all power  
amplifiers utilize negative feedback to control gain  
and provide stability, but Crown uses multiple nested  
feedback loops for maximum stability and greatly  
improved damping.MostCrownamplifiershavedamp-  
ing inexcessof1000inthebassfrequencyrange.This  
feedback, along with our compensation and ultra-low  
distortion output topology, make Crown amplifiers  
superior.  
Variable Gain Stage (VGS)  
Note: Older models only had two front end stages.  
The functions of this stage were combined, primarily,  
with those of the third.  
FromtheoutputoftheBGS, thesignalgoestotheVGS  
where gain is determined by the position of the Sen-  
sitivity Switch, and level is determined by the level  
control. VGS is an inverting stage with the input being  
fed to its op-amp stage. Because gain after this stage  
is fixed at 26dB (factor of 20), greater amplifier sensi-  
Features specific to the Power Base/CSL Series’ in-  
8
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Power Base-1 & 460CSL Amplifier Service Manual  
Theory  
tivity is achieved by controlling the ratio of feedback to  
Voltage Translators  
input resistance. The Sensitivity Switch sets the input  
impedance to this stage and varies the gain such that  
the overall amplifier gain is 26 dB, or is adjusted  
appropriately for 0.775V or 1.4V input to attain rated  
output. Note that earlier models (before main modules  
built with D 7911-7 board) did not support the 1.4V  
sensitivity.  
A voltage divider network splits the Error Signal (ES)  
into positive and negative drive signals for the bal-  
anced voltagetranslatorstage.Theseoffsetreference  
voltages drive the input to the Voltage Translator  
transistors. A nested NFb loop from the output of the  
amplifier mixes with the inverted signal riding on the  
offset references. Thisnegativefeedbackfixesgainat  
the offset reference points (and the output of the Error  
Amp) at a factor of -25.2 with respect to the amplifier  
output. The Voltage Translators are arranged in a  
common base configuration for non-inverting voltage  
gain with equal gain. They shift the audio from the  
±15V reference to VCC reference. Their outputs drive  
their respective LVA.  
Error Amp  
The inverted output from the VGS is fed to the non-  
inverting input of the Error Amp op-amp stage through  
an AC coupling capacitor and input resistor. Amplifier  
output is fed back via the negative feedback (NFb)  
loop resistor. The ratio of feedback resistor to input  
resistor fixes gain from the Error Amp input to the  
output of the amplifier at 26 dB. Diodes prevent  
overdriving the Error Amp. Because the Error Amp  
amplifies the difference between input and output  
signals, any difference in the two waveforms will  
produce a near open loop gain condition which in turn  
results in high peak output voltage. The output of the  
Error Amp, called the Error Signal (ES) drives the  
Voltage Translators.  
Also tied into the Voltage Translator inputs are ODEP  
limiting transistors and control/protection transistors.  
The ODEP transistors steal drive as dictated by the  
ODEP circuitry (discussed later). The control/protec-  
tion transistors act as switches to totally shunt audio to  
ground during the turn-on delay, or during a DC/LF or  
Fault protective action.  
Last Voltage Amplifiers (LVAs)  
The Voltage Translator stage channels the signal to  
the Last Voltage Amplifiers (LVA's) in a balanced  
configuration. The+LVAand -LVA, withtheirpush-pull  
effect through the Bias Servo, drive the fully comple-  
mentary output stage. The LVAs are configured as  
common emitter amplifiers. This configuration pro-  
videssufficientvoltagegainand invertstheaudio. The  
polarity inversion is necessary to avoid an overall  
polarity inversion from input jack to output jack, and it  
VOLTAGE AMPLIFICATION  
The Voltage Translator stage separates the output of  
the Error Amp into balanced positive and negative  
drive voltages for the Last Voltage Amplifiers (LVAs),  
translating the signal from ground referenced ±15V to  
±Vcc reference. LVAsprovidethemainvoltageampli-  
fication and drive the High Side output stages. Gain  
from Voltage Translator input to amplifier output is a  
factor of 25.2.  
+15V  
+VCC  
Voltage  
BGS  
VGS  
Error  
Amp  
Translators  
Q105  
Q100  
Q103  
Q121 Q101  
+
+
+
-
NPN Outputs (+HS)  
PNP Outputs (-HS)  
Audio  
Inputs  
Q102  
-
-
Q122  
Q110  
+
-
Mute  
NFb Loop  
-VCC  
-15V ODEP  
LVA's  
Figure 1. Typical Amplifier Front End and Voltage Amplification Stages.  
9
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Power Base-1 & 460CSL Amplifier Service Manual  
Theory  
allows the NFb loop to control Error Amp gain by  
The output of the +LVA drives the base of predriver  
device. Together, the predriver and driver form the  
first two parts of the three-deep Darlington and are  
biased class AB. They provide output drive through  
the bias resistor, bypassing the output devices, at  
levels below about 100mW. An RLC network between  
the predriver and driver provide phase shift compen-  
sation and limit driver base current to safe levels.  
Output devices are biased class B, just below cutoff.  
Atabout100mWoutputtheyswitchontoconducthigh  
current to the load. Together with predriver and driver,  
the output device provide an overall class AB+B  
output.  
feeding back to its non-inverting input (with its polarity  
opposite to the output of the VGS). With the added  
voltage swing provided by the LVAs, the signal then  
gains current amplification through the Darlington  
emitter-follower output stage.  
GROUNDED BRIDGE TOPOLOGY  
Figure 2 is a simplified example of the grounded  
bridge output topology. It consists of four quadrants  
of three deep Darlington (composite) emitter-follower  
stages per channel: one NPN and one PNP on the  
High Side of the bridge (driving the load), and one  
NPN and one PNP on the Low Side of the bridge  
(controlling the ground reference for the rails). The  
output stages are biased to operate class AB+B for  
ultra low distortion in the signal zero-crossing region  
and high efficiency.  
The negative half of the HS is almost identical to the  
positive half, except that the devices are PNP. One  
difference is that the PNP bias resistor is slighter  
greater in value so that PNP output devices run closer  
to the cutoff level under static (no signal) conditions.  
This is because PNP devices require greater drive  
current.  
High Side (HS)  
The High Side (HS) of the bridge operates much like  
a conventional bipolar push-pull output configuration.  
As the input drive voltage becomes more positive, the  
HS NPN conducts and delivers positive voltage to the  
load. Eventually the NPN devices reach full conduc-  
tion and +Vcc is across the load. At this time the HS  
PNP is biased off. When the drive signal is negative  
going, the HS PNP conducts to deliver -Vcc to the load  
and the HS NPN stage is off.  
HS bias is regulated by Q18, the Bias Servo. Q18 is a  
Vbe multiplier which maintains approximately 3.3V  
Vceunderstatic conditions. Thepositiveand negative  
halves of the HS output are in parallel with this 3.3V.  
With a full base-emitter on voltage drop across  
predrivers and drivers, the balance of voltage results  
in approximately .35V drop across the bias resistors in  
+
+Vcc (Positive Rail)  
Input  
signal  
Load  
(speaker)  
Inverting Op-amp  
-Vcc (Negative Rail)  
HIGH SIDE  
LOW SIDE  
-
Figure 2. Crown Patented Grounded Bridge Topology  
10  
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Power Base-1 & 460CSL Amplifier Service Manual  
Theory  
thepositivehalf, and about.5Vacrossthebiasresistor  
in the negative half. Q18 conduction (and thus bias) is  
adjustable.  
anegativepolarity.Using thesameexampleasabove,  
a 70V supply would allow a negative output peak of -  
70V. In summary, a power supply which produces a  
total of 70VDC rail to rail (or ±35VDC statically) is  
capableofproducing 140Vpeak-to-peakattheampli-  
fier output when the grounded bridge topology is  
used. The voltage used in this example are relatively  
close to the voltages of the PB-1/460CSL.  
A diode string prevents excessive charge build up  
within the high conduction output devices when off.  
Flyback diodes shunt back-EMF pulses from reactive  
loads to the power supply to protect output devices  
from dangerous reverse voltage levels. An output  
terminating circuit blocks RF on output lines from  
entering the amplifier through its output connectors.  
The total effect is to deliver a peak to peak voltage to  
the speaker load which is twice the voltage produced  
by the power supply. Benefits include full utilization of  
the power supply (it conducts current during both  
halves of the output signal; conventional designs  
require two power supplies per channel, one positive  
and one negative), and never exposing any output  
device to more than half of the peak to peak output  
voltage (which does occur in conventional designs).  
Low Side (LS)  
The Low Side (LS) operates quite differently. The  
power supply bridge rectifier is not ground refer-  
enced, nor is the secondary of the main transformer.  
In other words, the high voltage power supply floats  
with respect to ground, but ±Vcc remain constant with  
respect to each other. This allows the power supply to  
deliver +Vcc and -Vcc from the same bridge rectifier  
and filter as a total difference in potential, regardless  
of their voltages with respect to ground. The LS uses  
inverted feedback from the HS output to control the  
ground reference for the rails (±Vcc). Both LS quad-  
rants are arranged in a three-deep Darlington and are  
biased AB+B in the same manner as the HS.  
Low side bias is established by a diode string which  
also shunts built up charges on the output devices.  
Bias is adjustable via potentiometer. Flyback diodes  
perform the same function as the HS flybacks. The  
output of the LS is tied directly to chassis ground via  
ground strap.  
OUTPUT DEVICE EMULATION PROTECTION  
(ODEP)  
When the amplifier output swings positive, the audio is  
fed to an op-amp stage where it is inverted. This  
inverted signal is delivered directly to the bases of the  
positive (NPN) and negative (PNP) LS predrivers. The  
negative drive forces the LS PNP devices on (NPN  
off). As the PNP devices conduct, Vce of the PNP  
Darlington drops. With LS device emitters tied to  
ground, -Vcc is pulled toward ground reference.  
Since the power supply is not ground referenced (and  
the total voltage from +Vcc to -Vcc is constant) +Vcc  
is forced higher above ground potential. This contin-  
ues until, at the positive amplifier output peak, -Vcc =  
0V and +Vcc equals the total power supply potential  
with a positive polarity. If, for example, the power  
supplyproduced atotalof70Vfromrailtorail(±35VDC  
measured from ground with no signal), the amplifier  
output would reach a positive peak of +70V.  
To further protect the output stages, a specially devel-  
oped ODEP circuit is used. It produces a complex  
analog output signal. This signal is proportional to the  
always changing safe-operating-area margin of the  
output transistors. The ODEP signal controls the Volt-  
age Translator stage by removing drive that may  
exceed the safe-operating-area of the output stage.  
ODEP senses output current by measuring the volt-  
age dropped across LS emitter resistors. LS NPN  
current (negative amplifier output) and +Vcc are  
sensed, then multiplied to obtain a signal proportional  
to output power. Positive and negative ODEP voltages  
are adjustable via two potentiometers. Across ±ODEP  
are a PTC and a thermal sense (current source). The  
PTC is essentially a cutoff switch that causes hard  
ODEP limiting if heatsink temperature exceeds a safe  
maximum, regardless of signal level. The thermal  
sense causes the differential between +ODEP and –  
ODEPtodecreaseasheatsinktemperatureincreases.  
An increase in positive output signal output into a load  
will result in –ODEP voltage dropping; an increase in  
negativeoutputvoltageand currentwillcause+ODEP  
voltage to drop. A complex RC network between the  
Conversely, during a negative swing of the HS output  
where HS PNP devices conduct, the op-amp would  
output a positive voltage forcing LS NPN devices to  
conduct. This would result in +Vcc swinging toward  
ground potential and -Vcc further from ground poten-  
tial. At the negative amplifier output peak, +Vcc = 0V  
and -Vcc equals the total power supply potential with  
11  
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Power Base-1 & 460CSL Amplifier Service Manual  
Theory  
±ODEP circuitry is used to simulate the thermal barri-  
ers between the interior of the output device die  
(immeasurable by normal means) and the time delay  
from heat generation at the die until heat dissipates to  
the thermal sensor. The combined effects of thermal  
history and instantaneous dynamic power level result  
in an accurate simulation of the actual thermal condi-  
tion of the output transistors.  
POSITIVE  
HIGH SIDE  
OUTPUT  
+LVA  
-1  
+VOLTAGE  
TRANSLATOR  
NPN STAGE  
ERROR  
AMP  
BGS  
VGS  
OUTPUT  
DEVICE  
EMULATION  
PROTECTION  
HIGH SIDE  
BIAS  
SERVO  
BALANCED  
INPUTS  
-1  
NEGATIVE  
HIGH SIDE  
OUTPUT  
-LVA  
-1  
-VOLTAGE  
TRANSLATOR  
PNP STAGE  
MAIN NEGATIVE FEEDBACK (NFb) LOOP  
POSITIVE  
LOW SIDE  
OUTPUT  
NPN STAGE  
LOW SIDE  
BIAS  
DIODE  
-1  
STRING  
NEGATIVE  
LOW SIDE  
OUTPUT  
INVERTING  
BRIDGE  
BALANCE  
PNP STAGE  
Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown)  
12  
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Power Base-1 & 460CSL Amplifier Service Manual  
Checkout Procedures  
The following is a list of ODEP Bias Voltages VS.  
Temperature.  
GENERAL INFORMATION  
The following test procedures are to be used to verify  
operation of this amplifier. DO NOT connect a load or  
inject a signal unless directed to do so by the proce-  
dure. These tests, though meant for verification and  
alignment of the amplifier, may also be very helpful in  
troubleshooting. For best results, tests should be  
performed in order.  
°F  
66  
68  
70  
72  
74  
76  
77  
78  
80  
82  
84  
86  
88  
90  
92  
94  
°C  
V–ODEP  
–10.31  
–10.26  
–10.20  
–10.14  
–10.09  
–10.03  
–10.00  
–9.97  
–9.91  
–9.86  
–9.80  
–9.74  
V+ODEP  
11.41  
11.36  
11.30  
11.24  
11.19  
11.13  
11.10  
11.07  
11.01  
10.96  
10.90  
10.84  
10.79  
10.73  
10.67  
10.61  
18.9  
20.0  
21.1  
22.2  
23.3  
24.4  
25.0  
25.6  
26.7  
27.8  
28.9  
30.0  
31.1  
32.2  
33.3  
34.4  
AlltestsassumethatACpowerisfromaregulated 120  
VAC source. Test equipment includes an oscillo-  
scope, a DMM, a signal generator, loads, and I.M.D.  
and T.H.D. noise test equipment.  
STANDARD INITIAL CONDITIONS  
Level controls fully clockwise.  
Stereo/Mono switch in Stereo.  
Sensitivity switch in 26 dB fixed gain position.  
It is assumed, in each step, that conditions of the  
amplifier are per these initial conditions unless other-  
wise specified.  
–9.69  
–9.63  
–9.57  
–9.51  
–ODEP Procedure: Measure pin 6 of U100 and, if  
necessary, adjust R121 to obtain V–ODEP as specified  
above. Measure pin 6 of U200 and, if necessary,  
adjust R221 to obtain V–ODEP as specified above.  
+ODEP Procedure: Measure pin 6 of U103 and, if  
necessary, adjust R132 to obtain V+ODEP as specified  
above. Measure pin 6 of U203 and, if necessary,  
adjust R232 to obtain V+ODEP as specified above.  
TEST 1: DC OFFSET  
Spec: 0 VDC, ±10 mV.  
Initial Conditions:Controlsperstandard,inputsshorted.  
Procedure: Measure DC voltage at the output connec-  
tors (rear panel). There is no adjustment for output  
offset. If spec is not met, there is an electrical malfunc-  
tion. Slightly out of spec measurement is usually due  
to U104/U204 out of tolorance.  
TEST 2: OUTPUT BIAS ADJUSTMENT  
Spec: 300 to 310 mVDC.  
Initial Conditions: Controls per standard, heatsink tem-  
perature less than 40°C.  
Procedure:MeasureDCvoltagesontheoutputmodule  
across R31, adjust R26 if necessary. Measure DC  
voltages on the output module across R32, adjust R23  
if necessary. Repeat for second channel.  
TEST 3: ODEP VOLTAGE ADJUSTMENT  
Spec: Cold Bias Per Charts Below ±0.1V DC.  
Initial Conditions: Controls per standard, heatsink at  
room temperature 20 to 30°C (68 to 86°F). Note: This  
adjustment should normally be performed within 2  
minutes of turn on from ambient (cold) conditions. If  
possible measure heatsink temperature, if not mea-  
sure ambient room temperature. Use this information  
when referencing the chart below.  
13  
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Power Base-1 & 460CSL Amplifier Service Manual  
Checkout Procedures  
Procedure: No Load. Inject a 1 kHz sine wave. With  
TEST 4: AC POWER DRAW  
level controls fully clockwise you should see full gain.  
As controls are rotated counterclockwise, observe  
similar gain reduction in each channel. When com-  
plete, return level controls to fully clockwise position.  
Spec: 90 Watts maximum quiescent.  
Initial Conditions: Controls per standard.  
Procedure: With no input signal and no load, measure  
AC line wattage draw. If current draw is excessive,  
check for high AC line voltage or high bias voltage.  
TEST 9: CURRENT LIMIT  
Spec: Current Limit at 13 ±2 Amps  
TEST 5: COMMON MODE REJECTION  
Initial Conditions: Controls per standard.  
Procedure: Load each channel to 1 Ohm. Inject a 1 kHz  
differentiated (or 10% duty cycle) square wave and  
increase output level until current limit occurs. Current  
limit should occur at 11 ±1 Amps. Observe clean (no  
oscillations) current clipping.  
Spec at 100 Hz: –70 dB.  
Spec at 20 kHz: –50 dB.  
Initial Conditions: Controls per standard.  
Procedure: No load. Inject a 0 dBu 100 Hz sine wave  
intoeachchannel,onechannelatatime,withinverting  
and non-inverting inputs shorted together. At the  
output measure less than –44 dBu. Inject a 0 dBu 20  
kHz sine wave into each channel, one channel at a  
time, with inverting and non-inverting inputs shorted  
together. At the output measure less than –24 dBu.  
Adjust R921 or R1021, if necessary, to obtain the  
required measurements. (In older units the adjust-  
ments are done using N100/N200.)  
TEST 10: SLEW RATE & 10 KHZ SQUARE WAVE  
Spec: >13V/µS.  
Initial Conditions: Controls per standard.  
Procedure: Load each channel to 8 ohms. Inject a 10  
kHz square wave to obtain 40 volts peak-to-peak at  
each output. Observe the slope of the square wave. It  
should typically measure 17 to 25 V/µS. Also, the  
square wave must not include overshoot, ringing, or  
any type of oscillation.  
TEST 6: VOLTAGE GAIN  
Spec: ±3% when the Sensitivity Switch is set for 26dB  
gain, ±6% when the Sensitivity Switch is set for 0.775V  
or 1.4V sensitivity.  
TEST 11: CROSSTALK  
Spec: <33 mVAC at 20 kHz.  
Initial Conditions: Controls per standard.  
Procedure: No load connected. Inject a 0.775 VAC 1  
kHz sine wave with the Sensitivity Switch in the 26 dB  
position. Measure 15.5 VAC ±0.07 VAC at the ampli-  
fieroutput. Injecta0.775VAC1kHzsinewavewiththe  
SensitivitySwitchinthe0.775Vposition. Measure39.9  
VAC ±1.2 VAC at the amplifier output. Inject a 1.4 VAC  
1 kHz sine wave with the Sensitivity Switch in the 1.4V  
position. Measure 39.9 VAC ±1.2 VAC at the amplifier  
output. Return the Sensitivity Switch to the 26 dB  
position.  
Initial Conditions: Controls per standard. Short input of  
channel not driven.  
Procedure:8ohmload oneachchannel.Injecta20kHz  
sinewaveintotheChannel1inputand increaseoutput  
level to 37.4 VAC. Measure less than 33 mVAC at the  
output of Channel 2. Inject a 20 kHz sine wave into the  
Channel2inputand increaseoutputlevelto37.4VAC.  
Measure less than 33 mVAC at the output of Channel  
1.  
TEST 12: OUTPUT POWER  
TEST 7: PHASE RESPONSE  
Spec: ±10° at 1 Watt.  
Spec at 8 Ohm Stereo: 205W at 0.1% THD.  
Spec at 4 Ohm Stereo: 230W at 0.1% THD.  
Initial Conditions: Controlsperstandard, 8ohmload on  
each channel.  
Procedure: Inject a 1 kHz sine wave and adjust for 1  
Watt output (2.8 VAC). Check input and output signals  
against each other, input and output signals must be  
within 10° of each other.  
Initial Conditions: Controls per standard.  
Procedure:Load eachchannelto8ohms.Injecta1kHz  
sinewaveand measureatleast40.5VACattheoutput  
of each channel. Load each channel to 4 ohms. Inject  
a 1 kHz sine wave and measure at least 30.3 VAC. All  
power measurements must be at less than 0.1% THD.  
TEST 8: LEVEL CONTROLS  
Spec: Level controlled by level controls.  
Initial Conditions: Controls per standard.  
TEST 13: REACTIVE LOADS  
Spec: No oscillations. Safe with all types of loads.  
Initial Conditions: Controls per standard.  
14  
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Power Base-1 & 460CSL Amplifier Service Manual  
Checkout Procedures  
Procedure Capacitive: Load each channel to 8 ohms in  
parallel with 2 µF. Inject a 20 kHz sine wave with 30  
VAC output for 10 seconds.  
Procedure Inductive: Load each channel to 8 ohms in  
parallel with 159 µHenries. Inject a 1 kHz sine wave  
with 15 VAC output for 10 seconds.  
TEST 15: LF PROTECTION  
Spec: Amplifier mutes for low frequency.  
Initial Conditions: Controls per standard.  
Procedure: No load. Inject a 0.5 Hz 6 volt peak-to-peak  
square wave into each channel and verify that each  
channel cycles into mute.  
Procedure Torture: Load each channel with the primary  
(red and black leads) of a DC-300A transformer (D  
5781-6). Inject a 10 Hz sine wave at sufficient output  
level to cause 3 to 5 flyback pulses, for 10 seconds.  
Procedure Short: Inject a 60 Hz sine wave at 5 VAC.  
After establishing signal, short the output for 10 sec-  
onds.  
TEST 16: SIGNAL TO NOISE RATIO  
Spec: 100 dB (105 dB A-weighted) below rated 8 ohm  
power.  
Initial Conditions: Controls per standard. Short inputs.  
Procedure: Load each channel to 8 ohms. Measure  
lessthan400µVattheoutputofeachchannel(or–100  
dB from reference of +34.25 dBu).  
TEST 14: ODEP LIMITING  
Spec: No oscillation on ODEP Limiting wave form;  
either channel controls limiting in Parallel Mono Mode.  
Initial Conditions: Controls per standard; rag or other  
obstruction blocking fan so that it does not turn.  
Procedure: Load the amplifier to 2 ohms on each  
channel. Inject a 60 Hz sine wave and adjust for 15  
Vrmsattheoutput. Afterafewminutesobserveawave  
form similar to Figure 4. Remove the input signal from  
both channels and allow the amplifier to cool for a few  
minutes. Switch the amplifier to Parallel Mono and  
remove the load from Channel 1. Inject the signal into  
Channel 1 and observe that ODEP limiting occurs at  
the output of both channels. Remove the load from  
Channel 2, and install the load on Channel 1. Again,  
observe that both channels limit. Return all amplifier  
controls to standard initial conditions. Remove the fan  
obstruction.  
TEST 17: TURN ON TRANSIENTS  
Spec: No dangerous transients.  
Initial Conditions: Controls per standard.  
Procedure: From an off condition, turn on the amplifier  
and monitor the output noise at the time of turn on.  
Note: Turn on noise may increase significantly if the  
amplifier is cycled off and on.  
TEST 18: TURN OFF TRANSIENTS  
Spec: No dangerous transients.  
Initial Conditions: Controls per standard.  
Procedure: From an on condition, turn off the amplifier  
and monitor the output noise at the time of turn off.  
Note: Turn off noise may increase significantly if the  
amplifier is cycled off and on.  
TEST 19: INTERMODULATION DISTORTION  
Spec at 0 dB Output: 0.01%.  
Spec at –35 dB Output: 0.05%.  
Initial Conditions: Controls per standard.  
Procedure: Load each channel to 8 ohms. Inject a  
SMPTEstandard IMsignal(60Hzand 7kHzsinewave  
mixed at 4:1 ratio) at 200 Watts (32.4 VAC). With an IM  
analyzer measure less than 0.01% IMD. Repeat test at  
–35 dB (reference 200 Watts or 32.4 VAC) and mea-  
sure less than 0.05% IMD.  
TEST 20: CLIPPING  
Spec: No protective action during test.  
Initial Conditions: Controls per standard.  
Procedure:Load eachchannelto8ohms.Injecta1kHz  
sine wave at each input and drive output 6 dB into clip  
for 10 seconds. The amplifier should not activate any  
protective circuits (ODEP, Fault, or LF Protection).  
POST TESTING  
After completion of testing, if all tests are satisfactory,  
Figure 4. ODEP Limiting Wave Form  
the amplifier controls should be returned to the posi-  
15  
tions required by customer. If conditions are unknown  
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or unspecified, factory settings are as follows:  
Power Base-1 & 460CSL Amplifier Service Manual  
Checkout Procedures  
16  
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Power Base-1 & 460CSL Amplifier Service Manual  
Mechanical (Non-Module) Parts  
SUPPLIMENTAL ITEMS  
CPN  
ITEM  
QTY  
D 4137-2  
C 3342-0  
A10087-71012  
Nylon Thumbscrew Washer  
Feet, Black Self-Stick  
10-32 .75 Machine (Rack Screw)  
4
4
4
120VAC/60HZ NORTH AMERICA PRODUCT ONLY  
CPN  
ITEM  
QTY  
A10285-26  
A10285-7  
D 6589-2  
A10101-19  
H42873-2  
P10391-4  
P10426-6  
Fuse, 10A 3AB (120V Units)  
Fuse, .5A AGC 1.25x.25 (LVPS)  
PB-1 Power Transformer  
Washer, Fiber (XFMR Assby)  
Fanformer Assembly  
1
1
1
2
1
1
1
Fuse Board (U.S. Only)  
Fuse Board (International Only)  
FANFORMER MECHANICAL ASSEMBLY  
CPN  
ITEM  
QTY  
C 7062-0  
C 9939-7  
D 8439-8  
Screw, 6-32-5/16 Flat Mach  
Fan Blade, 4 inch CCW  
Fan Bracket  
2
1
1
FILTER CAPACITOR MOUNTING ASSEMBLY (ONE PER CHANNEL)  
CPN  
ITEM  
QTY  
A10095-4  
A10098-5  
C 7015-8  
C 8752-5  
C 9870-4  
D 6764-1  
D 8438-0  
Washer, #10 Ext. Lock  
Belleville Spring Washer  
C126/C226 7800µF 90V  
D117/D217 35A 400V Bridge Rectifier  
Screw, 10-32-.38 Pan  
Washer, Shoulder  
2
2
1
1
2
2
1
Bracket, Capacitor Mounting  
FUSE BOARD ASSEMBLY  
CPN  
ITEM  
QTY  
C 5060-6  
P10391-4  
Fuse Clip, PC Mount #926  
Fuse Board  
4
1
LED ASSEMBLY  
CPN  
ITEM  
QTY  
C 4342-9  
P10068B4  
Enable LED, Amber  
LED Board  
1
1
17  
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Power Base-1 & 460CSL Amplifier Service Manual  
Mechanical (Non-Module) Parts  
OUTPUT ASSEMBLY (ONE PER CHANNEL)  
CPN  
ITEM  
QTY  
A10100-4  
A10315-1  
C 4751-1  
C 5826-0  
C 6492-0  
C 7326-9  
C 8573-5  
C 8574-3  
C 8813-5  
C 9491-9  
D 7665-9  
D 7666-7  
D 7796-2  
D 7797-0  
D 8264-0  
F12019-0  
F12469-7  
Washer, #6 Flat Zinc  
Screw, 6-32-.56 Hex Washer Head  
NPN Output Device  
S100/S200 Thermal Sense LM334Z  
PNP Output Device  
Solder Lug, #6 Tin  
PNP Driver Device TO-3P  
NPN Driver Device TO-3P  
Q318/Q418 Bias Servo MPSA18/MPS8097  
Screw, 6-32-.312 Taptite Pan Ph  
Clip, TO-3P Mounting  
Bracket, TO-3P Heatsink  
Silpad Insulator  
Output Thru-Hole Pad Insulator  
PTC Thermal Sensor  
2
12  
2
1
2
2
2
2
1
13  
2
2
1
1
1
1
2
Diode Heatsink Slug  
Heatsink, Aluminum  
Output Module (See Module List)  
1
BACK PANEL ASSEMBLY  
CPN  
ITEM  
QTY  
A10214-7  
C 2823-0  
D 7074-4  
M21208J9  
A10019-8  
Strain Relief (Power Cord)  
Dual Binding Post Assembly  
Power Cord (3-14 15A USA)  
Back Panel  
1
1
1
1
2
Nut, #8 32-2 Captive  
CHASSIS FRONT ASSEMBLY  
CPN  
ITEM  
QTY  
4
3
4
3
20  
3
1
A10031-1  
A10090-70806  
A10090-70808  
A10101-5  
A10110-70605  
A10173-1  
D 6944-9  
Nut, 8-32 Captive  
Screw, 8-32-.375 Mach Ph Oval (Grille)  
Screw, 8-32-.5 Mach Ph Oval  
Washer, Nylon (Grille)  
Screw, 6-32-.312 Taptite Ph (Cover)  
Clip, Grille Filter  
Air Filter  
D 8465J2  
D 8501-5  
End Cap  
Cover, Top  
2
1
D 8548-6  
Cover, Bottom  
1
F10962-3  
F11978J7  
F12435J7  
Front Panel Overlay PB-1  
Front Panel Overlay 460CSL  
Grille  
1
1
1
18  
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Power Base-1 & 460CSL Amplifier Service Manual  
Mechanical (Non-Module) Parts  
MAIN CHASSIS ASSEMBLY  
CPN  
ITEM  
QTY  
A10086-11008  
A10086-70806  
A10089-11032  
A10094-3  
A10094-6  
A10094-8  
A10099-7  
A10100-16  
A10102-8  
A10109-10822  
A10110-70812  
A10192-1  
C 1811-6  
C 3163-0  
C 6487-0  
C 6912-7  
C 6913-5  
C 6914-3  
C 9491-9  
C 9953-8  
D 7340-9  
Screw, 10-32-.5 Mach Rd Ph  
Screw, 8-32-.37 Mach Rd Ph  
Screw, 10-32-2 Mach Pan Ph  
Washer, #6 Black Star  
Washer, #8 Black Star  
Washer, #10 Tooth Lock  
Washer, #10 Nylon Shoulder  
Washer  
4
2
4
3
4
10  
4
4
6
2
2
4
4
1
1
2
2
2
4
6
1
1
1
1
1
1
1
1
1
Nut, 10-32 Hex Zinc  
Screw, 8-18-1.375 Pan Ph  
Screw, 8-32-.75 Taptite Pan Ph  
Snap Bushing .5  
Tie Wrap  
Solder Lug #6 505  
Power Switch 22A Rocker 2 Pole  
Tension Retainer Board Support  
Spacer Nut, 1 inch  
Spacer Nut, .75 inch  
Screw, 6-32-.312 Taptite Pan  
Screw, 6-20-.312 Taptite Pan Black  
Label, F1 Fuse Replacement  
Ground Strap (DBP to Chassis)  
Label, Sensitivity Switch  
Label, F200 Fuse Replacement  
Insulator, Fuse Board  
Back Panel Plate  
Transformer Plate  
Chassis  
Main Module (See Module List)  
D 7600-6  
D 7784-8  
D 8003-2  
D 8069-4  
F10787J3  
F10963-1  
M21059J6  
19  
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Power Base-1 & 460CSL Amplifier Service Manual  
Module Information  
MODULE HISTORY  
MAIN MODULES:  
Since its introduction in 1986, the PB-1 has gone  
through a number of updates and revisions. Over the  
course of its history some of these changes have  
resulted in upgrading to newer modules. What follows  
is a historical breakdown of PB-1 modules. It should  
also be noted that the 460CSL was introduced in 1992  
and therefor modules obsoleted before that time were  
never used in the CSL version.  
Q42552A0  
This was the original main board. It offered 2 front end  
gain stages and was also used in the PB-1, MT-600/  
LX, MT-1200/LX. It did not include ground lift, but did  
offer a choice of .775V or 26 dB voltage gain sensitivi-  
ties. No longer available.  
Q42664-5  
ServicereplacementforQ42552A0forPB-1.Nolonger  
available.  
Q42682-7  
OUTPUT MODULES:  
Main #2. Upgraded board from Q42552A0 for PB-1.  
No longer available.  
Q42776-7  
Q42576-1  
Original output module. No longer available.  
Q42661-1  
Universally usable PC board, finished module used in  
MT-600/1200, MA-600/1200, and PB-1. Added third  
gain stage and ground lift switch. For use in the PB-1  
install two level pots (C 7409-3) and remove R187 and  
R287. Can replace all older modules. Use this module  
to replace this or any previous module. This module  
can also be used to replace the Q42953-2 module put  
into production later. Note that if this module is being  
used to replace an older module, you may have to  
slide the ground lift switch to the left (ground lift  
position) and clip off the plastic switch protrusion in  
order for the module to properly fit in the unit.  
Q42953-2  
Through hole output module. No longer available.  
Q42718-9  
Output module: 4 resistor small predriver. PB-1 Only.  
Last output module for PB-1 for use with TO-220  
package driver transistors.  
Q42885-6  
TO-3P Driver Output module. Not for use in THC units,  
not retrofittable into TO-220 driver transistor units.  
Q42967-2  
THCOutputmodulewithTO-3Pdrivers.Notretrofittable  
to any older units. Does not require special main  
module for THC ODEP recompensation. Also im-  
proved bias stability.  
PB-1 main module to replace Q42776-7. This or the  
Q42776-7 module may be used with TO-3P driver  
transistoroutputmodules,and withorwithoutThrough  
Hole Chassis (THC) in this amplifier.  
Q43200-7  
THC #2 Output Module. Replaces Q42967-2 only.  
Electrically identical, but larger screw head plates  
prevent shorting which could occur with the first THC  
output module.  
Q43060-5  
THC main module built on D 7993-5 circuit board. On  
this module the boost circuit has been deleted, the  
third position (1.4V) is added to the Sensitivity Switch,  
and additional fault circuitry has been added to the  
module. Althoughitispossibletomodifyanyolderunit  
to accept this module, it is recommended that the  
Q42776-7beused toreplacemainmodulesinallolder  
units, and this module be used only as a replacement  
for itself.  
20  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42576-1 Output Module Parts List (P10137-1 Board)  
Q42576-1 Output Module (4 Resistor Original) for PB-1:  
RESISTORS  
R00  
R01  
R02  
R03  
R08  
R09  
R10  
R11  
R12  
R13  
R14  
R15  
R20  
R21  
R22  
R23  
R24  
R25  
R26  
R27  
R28  
R30*  
A10266-7501 75  
A10266-4711 470  
CAPACITORS  
C01  
C02  
C03  
C04  
C05  
C06  
C07  
C08  
C 3978-1  
C 6804-6  
C 6804-6  
C 3996-3  
C 6807-9  
C 6806-1  
C 6807-9  
C 6810-3  
C 6809-5  
C 6806-1  
.047µF  
.1µF  
.1µF  
.0047µF  
.001µF  
.01µF  
.001µF  
180pF  
220pF  
.01uF  
C 7778-1  
C 6486-2  
C 6486-2  
C 7779-9  
5.6  
.2 5W  
.2 5W  
22  
A10266-4711 470  
C 1001-4  
C 1001-4  
2.7 1W  
2.7 1W  
A10266-7501 75  
C09  
C43  
C 1001-4  
C 6486-2  
C 6486-2  
C 7778-1  
C 7779-9  
C 6844-2  
2.7 1W  
.2 5W  
.2 5W  
5.6  
DIODES  
D01  
D02  
D03  
D04  
D05  
D06  
D07  
D08  
D09  
D10  
D11  
D12  
22  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
250 Pot LS Bias  
A10266-1331 13K  
A10266-2221 2.2K  
C 6844-2  
250 Pot HS Bias  
A10266-3911 390  
A10266-1331 13K  
A10265-10201* 102*  
MISC.  
Board  
Jumpers  
Clips  
P10137-1  
C 5868-2  
D 6414-3  
0 Ohm Jumper (8)  
Q17/19 Hold Down  
10 Pos. Connector  
J500 J600 C 7057-0  
INDUCTORS  
L00  
L01  
L02  
C 6592-6  
C 3510-2  
C 3510-2  
Output Coil  
470µH  
470µH  
Note: R30 is 102 Ohms in most units, though in some  
cases a different value may be used to match the  
installed S100/S200 LM334 (C5826-0) device grade.  
This is the standard value and is used with the most  
common LM334 grade, green. If the LM334 is marked  
with a blue dot, R30 should be a 107 Ohm resistor  
(A10265-10701); if it is marked with a yellow dot then  
R30 should be a 100 Ohm resistor (A10265-10001).  
TRANSISTORS  
Q17  
Q19  
C 3810-6  
C 3578-9  
NPN MPSA43  
PNP MPSA93  
21  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42661-1 Output Module Parts List (P10137-1 Board)  
Q42661-1 Output Module (4 Resistor #2) for PB-1:  
RESISTORS  
R00  
R01  
R02  
R07  
R09  
R10  
R11  
R12  
R13  
R14  
R15  
R16  
R19  
R21  
R22  
R23  
R24  
R25  
R26  
R27  
R28  
R30*  
A10266-7501 75  
A10266-4711 470  
CAPACITORS  
C01  
C02  
C03  
C04  
C05  
C06  
C07  
C08  
C 3978-1  
C 6804-6  
C 6804-6  
C 3996-3  
C 6807-9  
C 6806-1  
C 6807-9  
C 6810-3  
C 6809-5  
.047µF  
.1µF  
.1µF  
.0047µF  
.001µF  
.01µF  
.001µF  
180pF  
220pF  
C 7778-1  
D 6600-7  
C 7779-9  
5.6  
.19 5W  
22  
A10266-4711 470  
C 1001-4  
C 1001-4  
2.7 1W  
2.7 1W  
A10266-7501 75  
C 1001-4  
D 6600-7  
D 6600-7  
D 6600-7  
C 7778-1  
C 7779-9  
C 6844-2  
2.7 1W  
C09  
.19 5W  
.19 5W  
.19 5W  
5.6  
DIODES  
D01  
D02  
D03  
D04  
D05  
D06  
D07  
D08  
D09  
D10  
D11  
D12  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
22  
250 Pot LS Bias  
A10266-1331 13K  
A10266-2221 2.2K  
C 6844-2  
250 Pot HS Bias  
A10266-3911 390  
A10266-1331 13K  
A10265-10201* 102*  
MISC.  
Board  
P10137-1  
Jumpers  
Clips  
J500 J600 C 7057-0  
C 5868-2  
D 6414-3  
0 Ohm Jumper (4)  
Q17/19 Hold Down  
10 Pin Header  
INDUCTORS  
L00  
L01  
L02  
C 6592-6  
C 3510-2  
C 3510-2  
Output Coil  
470µH  
470µH  
Note: R30 is 102 Ohms in most units, though in some  
cases a different value may be used to match the  
installed S100/S200 LM334 (C5826-0) device grade.  
This is the standard value and is used with the most  
common LM334 grade, green. If the LM334 is marked  
with a blue dot, R30 should be a 107 Ohm resistor  
(A10265-10701); if it is marked with a yellow dot then  
R30 should be a 100 Ohm resistor (A10265-10001).  
TRANSISTORS  
Q17  
Q19  
C 3810-6  
C 3578-9  
NPN MPSA43  
PNP MPSA93  
22  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42718-9 Output Module Parts List (P10233-8 Board)  
Q42718-9 Output Module (4 Resistor #3) for PB-1:  
RESISTORS  
R00  
R01  
R07  
R10  
R11  
R12  
R13  
R14  
R15  
R16  
R19  
R23  
R24  
R25  
R26  
R27  
R28  
R30*  
R31  
R32  
R33  
R34  
R35  
R36  
R37  
R38  
R39  
R40  
A10266-7501 75  
A10266-4711 470  
CAPACITORS  
C01  
C02  
C03  
C04  
C05  
C06  
C07  
C08  
C 3978-1  
C 3218-2  
C 3218-2  
C 8534-7  
C 6807-9  
C 6806-1  
C 6807-9  
C 6810-3  
C 6809-5  
.047µF  
.22µF  
.22µF  
.0047µF  
.001µF  
.01µF  
.001µF  
180pF  
220pF  
D 6600-7  
.19 5W  
A10266-4711 470  
A10266-2R73 2.7 1W  
A10266-1204 12 2W  
A10266-7501 75  
A10266-1204 12 2W  
D 6600-7  
D 6600-7  
D 6600-7  
C 6844-2  
.19 5W  
.19 5W  
.19 5W  
250 Pot LS Bias  
C09  
A10266-1331 13K  
A10266-2221 2.2K  
DIODES  
D01  
D02  
D03  
D04  
D05  
D06  
D07  
D08  
D09  
D10  
D11  
D12  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
C 6844-2  
250 Pot HS Bias  
A10266-3911 390  
A10266-1331 13K  
A10265-10201* 102*  
C 7778-1  
C 7778-1  
C 7779-9  
C 7779-9  
5.6 .5W Flame Proof  
5.6 .5W Flame Proof  
22 .5W Flame Proof  
22 .5W Flame Proof  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
INDUCTORS  
L00  
L01  
L02  
C 6592-6  
C 3510-2  
C 3510-2  
1.3µH Output Coil  
470µH  
470µH  
MISC.  
Board  
P10233-8  
Jumpers  
Clips  
J500 J600 C 7057-0  
C 5868-2  
D 6414-3  
0 Ohm .25W  
Q17/Q19Hold Down  
10 Pin Header  
TRANSISTORS  
Q17  
Q19  
C 3810-6  
C 3578-9  
NPN MPSA43/42  
PNP MPSA93  
*Note: R30 is 102 Ohms in most units, though in some  
cases a different value may be used to match the  
installed S100/S200 LM334 (C5826-0) device grade.  
This is the standard value and is used with the most  
common LM334 grade, green. If the LM334 is marked  
with a blue dot, R30 should be a 107 Ohm resistor  
(A10265-10701); if it is marked with a yellow dot then  
R30 should be a 100 Ohm resistor (A10265-10001).  
23  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42885-6 Output Module Parts List (P10305-4 Board)  
Q42885-6 Output Module (4 Resistor TO-3P Drivers) for  
PB-1/460CSL:  
RESISTORS  
R00  
R01  
R04  
R07  
R10  
R11  
R12  
R13  
R16  
R19  
R23  
R24  
R25  
R26  
R27  
R28  
R29  
R30*  
R31  
R32  
R33  
R34  
R35  
R36  
R37  
R38  
R39  
R40  
A10266-7501 75  
A10266-4711 470  
CAPACITORS  
C01  
C02  
C03  
C04  
C05  
C06  
C07  
C08  
D 6600-7  
D 6600-7  
.19 5W  
.19 5W  
C 8511-5  
C 7964-7  
C 7964-7  
C 8534-7  
C 6807-9  
C 6806-1  
C 6807-9  
C 6810-3  
C 6809-5  
C 6806-1  
.047µF  
.22µF  
.22µF  
.0047µF  
.001µF  
.01µF  
.001µF  
180pF  
220pF  
.01uF  
A10266-4711 470  
C 1001-4  
C 3931-0  
2.7 1W  
12 2W  
A10266-7501 75  
D 6600-7  
D 6600-7  
C 6844-2  
.19 5W  
.19 5W  
250 Pot LS Bias  
C09  
C43  
A10266-1331 13K  
A10266-2221 2.2K  
C 6844-2  
250 Pot HS Bias  
A10266-3911 390  
A10266-1331 13K  
DIODES  
D01  
D02  
D03  
D04  
D05  
D06  
D07  
D08  
D09  
D10  
D11  
D12  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
C 6402-9  
51 OHM  
A10265-10201* 102*  
C 7778-1  
C 7778-1  
C 7779-9  
C 7779-9  
C 3931-0  
C 3931-0  
C 3931-0  
C 3931-0  
C 3931-0  
C 3931-0  
5.6 flame proof  
5.6 flame proof  
22 flame proof  
22 flame proof  
12 2W  
12 2W  
12 2W  
12 2W  
12 2W  
12 2W  
INDUCTORS  
MISC.  
Board  
Jumpers  
Clips  
L00  
L01  
L02  
C 6592-6  
C 3510-2  
C 3510-2  
Output Coil  
470µH  
470µH  
P10305-4  
C 5868-2  
D 6414-3  
0 Ohm Jumper (7)  
Q17/19 Hold Down  
10 Pos. Connector  
Over emitter of Q19  
J500 J600 C 7057-0  
BEAD C 8341-7  
TRANSISTORS  
Q17  
Q19  
C 3810-6  
C 3578-9  
NPN MPSA43  
PNP MPSA93  
Note: R30 is 102 Ohms in most units, though in some  
cases a different value may be used to match the  
installed S100/S200 LM334 (C5826-0) device grade.  
This is the standard value and is used with the most  
common LM334 grade, green. If the LM334 is marked  
with a blue dot, R30 should be a 107 Ohm resistor  
(A10265-10701); if it is marked with a yellow dot then  
R30 should be a 100 Ohm resistor (A10265-10001).  
24  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42967-2 Output Module Parts List (P10341-9 Board)  
Q42967-2 Output Module for Through Hole Chassis (THC)  
PB-1/460CSL units:  
RESISTORS  
R00  
R01  
R04  
R07  
R10  
R11  
R12  
R13  
R14  
R16  
R19  
R23  
R24  
R25  
R26  
R27  
R28  
R29  
R30*  
R31  
R32  
R33  
R34  
R35  
R36  
R37  
R38  
R39  
R40  
A10266-7501 75  
A10266-4711 470  
CAPACITORS  
D 6600-7  
D 6600-7  
.19 5W  
.19 5W  
C01  
C02  
C03  
C04  
C05  
C06  
C07  
C08  
C09  
C43  
C 8511-5  
.047µF  
.22µF  
.22µF  
.0047µF  
.0047µF  
.01µF  
.001µF  
180pF  
220pF  
.01µF  
C 7964-7  
C 7964-7  
C 8534-7  
C 8534-7  
C 6806-1  
C 6807-9  
C 6810-3  
C 6809-5  
C 6806-1  
A10266-4711 470  
A10266-2R73 2.7 1W  
A10266-1204 12 2W  
A10266-7501 75  
A10266-1204 12 2W  
D 6600-7  
D 6600-7  
C 6844-2  
.19 5W  
.19 5W  
250 Pot LS Bias  
A10266-1331 13K  
A10266-2221 2.2K  
C 6844-2  
250 Pot HS Bias  
DIODES  
D01  
D02  
D03  
D04  
D05  
D06  
D07  
D08  
D09  
D10  
D11  
D12  
A10266-3911 390  
A10266-1331 13K  
A10266-5101 51  
A10265-10201* 102*  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
C 7778-1  
C 7778-1  
C 7779-9  
C 7779-9  
5.6 .5W Flame Proof  
5.6 .5W Flame Proof  
22 .5W Flame Proof  
22 .5W Flame Proof  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
INDUCTORS  
L00  
L01  
L02  
C 6592-6  
C 3510-2  
C 3510-2  
Output Coil  
470µH  
470µH  
MISC.  
Board  
Jumpers  
Clips  
P10341-9  
C 5868-2  
D 6414-3  
0 Ohm (Qty 7)  
Q17/Q19Hold Down  
10 Pin Header  
TRANSISTORS  
Q17  
Q19  
J500 J600 C 7057-0  
C 3810-6  
C 3578-9  
NPN MPSA43  
PNP MPSA93  
*Note: R30 is 102 Ohms in most units, though in some  
cases a different value may be used to match the  
installed S100/S200 LM334 (C5826-0) device grade.  
This is the standard value and is used with the most  
common LM334 grade, green. If the LM334 is marked  
with a blue dot, R30 should be a 107 Ohm resistor  
(A10265-10701); if it is marked with a yellow dot then  
R30 should be a 100 Ohm resistor (A10265-10001).  
25  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q43200-7 Output Module Parts List (P10397-1 Board)  
Q43200-7 Output Module (THC #2) for PB-1/460CSL Units:  
RESISTORS  
R00  
R01  
R04  
R07  
R10  
R11  
R12  
R13  
R14  
R16  
R19  
R23  
R24  
R25  
R26  
R27  
R28  
R29  
R30*  
R31  
R32  
R33  
R34  
R35  
R36  
R37  
R38  
R39  
R40  
A10266-7501 75  
A10266-4711 470  
CAPACITORS  
C01  
C02  
C03  
C04  
C05  
C06  
C07  
C08  
C 8511-5  
C 7964-7  
C 7964-7  
C 8534-7  
C 8534-7  
C 6806-1  
C 6807-9  
C 6810-3  
C 6809-5  
C 6806-1  
.047µF  
.22µF  
.22µF  
.0047µF  
.0047µF  
.01µF  
.001µF  
180pF  
220pF  
.01µF  
D 6600-7  
D 6600-7  
.19 5W  
.19 5W  
A10266-4711 470  
A10266-2R73 2.7 1W  
A10266-1204 12 2W  
A10266-7501 75  
A10266-1204 12 2W  
D 6600-7  
D 6600-7  
C 6844-2  
.19 5W  
.19 5W  
250 Pot LS  
C09  
C43  
A10266-1331 13K  
A10266-2221 2.2K  
DIODES  
D01  
D02  
D03  
D04  
D05  
D06  
D07  
D08  
D09  
D10  
D11  
D12  
C 6844-2  
250 Pot HS  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
A10266-3911 390  
A10266-1331 13K  
A10266-5101 51  
A10265-10201* 102*  
C 7778-1  
C 7778-1  
C 7779-9  
C 7779-9  
5.6 .5W Flame Proof  
5.6 .5W Flame Proof  
22 .5W Flame Proof  
22 .5W Flame Proof  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
A10266-1204 12 2W  
INDUCTORS  
L00  
L01  
L02  
C 6592-6  
C 3510-2  
C 3510-2  
Output Coil  
470µH  
470µH  
MISC.  
Board  
P10397-1  
Jumpers  
Clips  
J500 J600 C 7057-0  
C 5868-2  
D 6414-3  
0 Ohm (Qty 7)  
Q17/Q19Hold Down  
10 Pin Header  
TRANSISTORS  
Q17  
Q19  
C 3810-6  
C 3578-9  
NPN MPSA43  
PNP MPSA93  
*Note: R30 is 102 Ohms in most units, though in some  
cases a different value may be used to match the  
installed S100/S200 LM334 (C5826-0) device grade.  
This is the standard value and is used with the most  
common LM334 grade, green. If the LM334 is marked  
with a blue dot, R30 should be a 107 Ohm resistor  
(A10265-10701); if it is marked with a yellow dot then  
R30 should be a 100 Ohm resistor (A10265-10001).  
26  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42552A0 Main Module Parts List (D 6304B2 Board)  
Q42552A0 Main Module (Original) for PB-1:  
D112 D212 C 3181-2  
D113 D213 C 3181-2  
D114 D214 C 3181-2  
D115 D215 C 3181-2  
D120 D220 C 3181-2  
D121 D221 C 3181-2  
D122 D222 C 3181-2  
D123 D223 C 3181-2  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
CAPACITORS  
C1  
C2  
C3  
C4  
C 4303-1  
C 3913-8  
C 4303-1  
C 6802-0  
1000uF  
470uF  
1000uF  
.47uF  
C100 C200 C 5053-1  
C101 C201 C 2821-4  
C103 C203 C 6805-3  
C104 C204 C 6805-3  
C105 C205 C 6950-7  
C106 C206 C 6950-7  
C108 C208 C 6812-9  
C112 C212 C 6803-8  
C113 C213 C 6802-0  
C114 C214 C 3729-8  
C115 C215 C 3729-8  
C116 C216 C 6802-0  
C117 C217 C 6803-8  
C118 C218 C 6812-9  
C122 C222 C 6811-1  
C124 C224 C 6809-5  
C125 C225 C 3729-8  
C127 C227 C 3729-8  
C133 C233 C 6814-5  
C134 C234 C 6805-3  
C135 C235 C 6805-3  
C136 C236 C 6808-7  
C137 C237 C 6808-7  
C138 C238 C 6814-5  
C139 C239 C 6814-5  
C140 C240 C 6812-9  
C141 C241 C 6812-9  
C142 C242 C 5162-0  
18uF  
10pF  
NETWORK RESISTORS  
N100 N200 D 4669-4  
N101 N201 D 6081-0  
N102 N202 D 6082-8  
.022uF  
.022uF  
82pF  
82pF  
47pF  
.12uF  
.47uF  
100uF 16V  
100uF 16V  
.47uF  
Balanced Input Trim  
Resistor Network-B  
Resistor Network-C  
TRANSISTORS  
Q100 Q200 D 2961-7  
Q101 Q201 C 3578-9  
Q102 Q202 C 3810-6  
Q103 Q203 C 3786-8  
Q104 Q204 C 3625-8  
Q105 Q205 C 3578-9  
Q106 Q206 C 3625-8  
Q107 Q207 C 3786-8  
Q108 Q208 D 2961-7  
Q109 Q209 D 2961-7  
Q110 Q210 C 3810-6  
Q111 Q211 D 2961-7  
Q112 Q212 C 3625-8  
Q113 Q213 C 3625-8  
Q115 Q215 D 2962-5  
Q116 Q216 C 3786-8  
Q117 Q217 D 2961-7  
Q118 Q218 D 2961-7  
Q119 Q219 C 3625-8  
Q120 Q220 C 3625-8  
SEL 2N3859A  
MPSA93  
MPSA43/A42  
PN4250A  
2N4125  
MPSA93  
.12uF  
47pF  
100pF  
220pF  
100uF 16V  
100uF 16V  
12pF  
.022uF  
.022uF  
470pF  
470pF  
12pF  
2N4125  
PN4250A  
SEL 2N3859A  
SEL 2N3859A  
MPSA43/A42  
SEL 2N3859A  
2N4125  
2N4125  
MPS8097  
PN4250A  
12pF  
47pF  
47pF  
3-12pF Trim  
SEL 2N3859A  
SEL 2N3859A  
2N4125  
2N4125  
DIODES  
RESISTORS  
D1  
D2  
D3  
D4  
D5  
D6  
D7  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N4148  
1N4148  
1N4148  
R1  
A10265-10031 100K 1%  
A10266-3321 3.3K  
R5  
R100 R200 C 6893-9  
5K POT  
R101 R201 A10265-49911 4.99K  
R102 R202 A10266-1021 1K  
R103 R203 A10265-10031 100K 1%  
R104 R204 A10266-2721 2.7K  
R105 R205 A10266-2721 2.7K  
R106 R206 A10266-1231 12K  
R107 R207 A10266-4731 47K  
R108 R208 A10266-1021 1K  
R109 R209 A10266-8201 82 OHM  
R110 R210 A10266-4731 47K  
R112 R212 A10266-5131 51K  
R113 R213 A10266-4721 4.7K  
D104 D204 C 2851-1  
D105 D205 C 2851-1  
D106 D206 C 2851-1  
D107 D207 C 2851-1  
D108 D208 C 3181-2  
D109 D209 C 3181-2  
D110 D210 C 3181-2  
D111 D211 C 3181-2  
27  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42552A0 Main Module Parts List (D 6304B2 Board)  
R114 R214 A10266-4721 4.7K  
SWITCHES  
S3  
S100  
R115 R215 A10266-5141 510K  
R116 R216 A10266-3351 3.3M  
R118 R218 A10266-2711 270 OHM  
R119 R219 A10266-3011 300 OHM  
R120 R220 A10266-2711 270 OHM  
C 6841-8  
C 6781-6  
4PDT  
6P3T  
IC’S  
U1  
U2  
C 5095-2  
C 5096-0  
MC7815  
MC7915  
UPA77 PNP  
UPA76 NPN  
MC34084P  
R121 R221 C 5062-2  
100K TRIMMER  
R122 R222 A10266-2741 270K  
R123 R223 A10266-1831 18K  
R124 R224 A10266-6821 6.8K  
U100 U200 C 6500-0  
U103 U203 C 6910-1  
U104 U204 C 6900-2  
R125 R225 C 7782-3  
R126 R226 C 7782-3  
100 OHM  
100 OHM  
MISC.  
Board  
J9  
J100 J200 C 6777-4  
J500 J800 D 6619-7  
J600 J700 D 6620-5  
MOUNTS U1, U2:  
R127 R227 A10266-6821 6.8K  
R128 R228 A10266-1031 10K  
R129 R229 A10266-1041 100K  
R130 R230 A10266-1041 100K  
R131 R231 A10266-1031 10K  
D 6304A4 or D 6304B2  
C 6871-5  
6-Cond Snap Mate  
PHONE JACK  
10" RIBBON ASSY  
6" RIBBON ASSY  
R132 R232 C 5062-2  
100K TRIMMER  
R133 R233 A10266-2741 270K  
R134 R234 A10266-1831 18K  
(2)  
(2)  
(2)  
(2)  
C 1889-2  
C 2176-3  
C 5341-0  
C 5594-4  
6-32 NUT  
6-32 X .5 SCREW  
HEATSINK  
R135 R235 C 7782-3  
100 OHM  
R136 R236 A10266-6821 6.8K  
STAR WASHER  
R137 R237 C 7782-3  
100 OHM  
MOUNTS U104, U204:  
R138 R238 A10266-6821 6.8K  
R139 R239 A10266-1021 1K  
R140 R240 A10266-8201 82 OHM  
R141 R241 A10266-1541 150K  
R142 R242 A10266-1541 150K  
R146 R246 A10266-1031 10K  
(2)  
C 3450-1  
14 Pin Socket  
COVERS FOR J100, J200:  
(2)  
C 6778-2  
Cover, Phone Jack  
Additional Parts  
(1)  
(1)  
(1)  
(1)  
C 4508-5  
C 5061-4  
C 6851-7  
C 7077-8  
C 6899-6  
16 PIN SOCKET  
1N3070 DIODE  
5-Pos Header  
3-Cond Wire Retain  
Wire Posts  
R147 R247 C 7781-5  
200 OHM  
R148 R248 A10266-2721 2.7K  
R149 R249 C 7781-5  
200 OHM  
R150 R250 A10266-2721 2.7K  
R151 R251 A10266-1031 10K  
R152 R252 A10266-1231 12K  
R154 R254 A10266-1011 100 OHM  
R156 R256 A10266-1321 1.3K  
R157 R257 A10266-1321 1.3K  
R158 R258 A10266-9121 9.1K  
R159 R259 A10266-1031 10K  
R161 R261 A10266-4701 47 OHM  
R162 R262 A10266-4701 47 OHM  
R165 R265 A10265-53611 5.36K 1%  
R146 R246 A10265-53611 5.36K 1%  
R167 R267 A10266-1021 1K  
R168 R268 A10265-95301 953 OHM  
R170 R270 A10266-1021 1K  
R171 R271 A10265-95301 953 OHM  
28  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42664-5 Main Module Parts List (D 6910-0 Board)  
Q42664-5 Main Module (Service Replacement For Origi-  
nal) for PB-1:  
D109 D209 C 3181-2  
D110 D210 C 3181-2  
D111 D211 C 5061-4  
D112 D212 C 3181-2  
D113 D213 C 3181-2  
D114 D214 C 3181-2  
D115 D215 C 3181-2  
D120 D220 C 3181-2  
D121 D221 C 3181-2  
D122 D222 C 3181-2  
D123 D223 C 5061-4  
1N4148  
1N4148  
1N3070  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N3070  
CAPACITORS  
C1  
C2  
C3  
C4  
C 4303-1  
C 3913-8  
C 4303-1  
C 6802-0  
1000uF  
470uF  
1000uF  
.47uF  
C100 C200 C 5311-3  
C101 C201 C 2821-4  
C103 C203 C 6805-3  
C104 C204 C 6805-3  
C105 C205 C 6950-7  
C106 C206 C 6950-7  
C108 C208 C 6812-9  
C112 C212 C 6803-8  
C113 C213 C 6802-0  
C114 C214 C 3729-8  
C115 C215 C 3729-8  
C116 C216 C 6802-0  
C117 C217 C 6803-8  
C118 C218 C 6812-9  
C122 C222 C 6811-1  
C123 C223 C 6811-1  
C124 C224 C 6809-5  
C125 C225 C 3729-8  
C127 C227 C 3729-8  
C128 C228 C 6803-8  
C133 C233 C 6814-5  
C134 C234 C 6805-3  
C135 C235 C 6805-3  
C136 C236 C 6808-7  
C137 C237 C 6808-7  
C138 C238 C 6814-5  
C139 C239 C 6814-5  
C140 C240 C 6812-9  
C141 C241 C 6812-9  
C242 C 5162-0  
22uF  
10pF  
.022uF  
.022uF  
82pF  
82pF  
47pF  
.12uF  
.47uF  
100uF 16V  
100uF 16V  
.47uF  
.12uF  
47pF  
100pF  
100pF  
220pF  
100uF 16V  
100uF 16V  
.12uF  
NETWORK RESISTORS  
N100 N200 D 4669-4  
N101 N201 D 6081-0  
N102 N202 D 6082-8  
Balanced Input Trim  
Resistor Network-B  
Resistor Network-C  
TRANSISTORS  
Q100 Q200 D 2961-7  
Q101 Q201 C 3578-9  
Q102 Q202 C 3810-6  
Q103 Q203 C 3786-8  
Q104 Q204 C 3625-8  
Q105 Q205 C 3578-9  
Q106 Q206 C 3625-8  
Q107 Q207 C 3786-8  
Q108 Q208 D 2961-7  
Q109 Q209 D 2961-7  
Q110 Q210 C 3810-6  
Q111 Q211 D 2961-7  
Q112 Q212 C 3625-8  
Q113 Q213 C 3625-8  
Q115 Q215 D 2962-5  
Q116 Q216 C 3786-8  
Q117 Q217 D 2961-7  
Q118 Q218 D 2961-7  
Q119 Q219 C 3625-8  
Q120 Q220 C 3625-8  
SEL 2N3859A  
MPSA93  
MPSA43/A42  
PN4250A  
2N4125  
MPSA93  
2N4125  
PN4250A  
SEL 2N3859A  
SEL 2N3859A  
MPSA43/A42  
SEL 2N3859A  
2N4125  
2N4125  
MPS8097  
PN4250A  
12pF  
.022uF  
.022uF  
470pF  
470pF  
12pF  
12pF  
47pF  
47pF  
3-12pF Trim  
SEL 2N3859A  
SEL 2N3859A  
2N4125  
2N4125  
DIODES  
RESISTORS  
D1  
D2  
D3  
D4  
D5  
D6  
D7  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
R1  
A10265-10031 100K 1%  
A10266-3323 3.3K 1W  
R5  
R100 R200 C 6893-9  
5K POT  
R101 R201 A10265-49911 4.99K  
R102 R202 A10266-1021 1K  
R103 R203 A10265-10031 100K 1%  
R104 R204 A10266-2721 2.7K  
R105 R205 A10266-2721 2.7K  
R106 R206 A10266-1231 12K  
R107 R207 A10266-4731 47K  
R108 R208 A10266-1021 1K  
R109 R209 A10266-8201 82 OHM  
D104 D204 C 2851-1  
D105 D205 C 2851-1  
D106 D206 C 2851-1  
D107 D207 C 2851-1  
D108 D208 C 3181-2  
29  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42664-5 Main Module Parts List (D 6910-0 Board)  
R110 R210 A10266-4731 47K  
R159 R259 A10266-1031 10K  
R161 R261 A10266-4701 47 OHM  
R162 R262 A10266-4701 47 OHM  
R165 R265 A10265-53611 5.36K 1%  
R146 R246 A10265-53611 5.36K 1%  
R167 R267 A10266-1021 1K  
R168 R268 A10265-95301 953 OHM  
R170 R270 A10266-1021 1K  
R171 R271 A10265-95301 953 OHM  
R111 R211 A10266-1231 12K  
R112 R212 A10266-5131 51K  
R113 R213 A10266-4721 4.7K  
R114 R214 A10266-4721 4.7K  
R115 R215 A10266-5141 510K  
R116 R216 A10266-3351 3.3M  
R117 R217 A10266-4731 47K  
R118 R218 A10266-2711 270 OHM  
R119 R219 A10266-3011 300 OHM  
R120 R220 A10266-2711 270 OHM  
SWITCHES  
R121 R221 C 5062-2  
100K TRIMMER  
S3  
C 6841-8  
C 6781-6  
4PDT  
6P3T  
R122 R222 A10266-2741 270K  
R123 R223 A10266-1831 18K  
R124 R224 A10266-6821 6.8K  
S100  
IC’S  
U1  
U2  
R125 R225 C 7782-3  
R126 R226 C 7782-3  
100 OHM  
100 OHM  
C 5095-2  
C 5096-0  
MC7815  
MC7915  
R127 R227 A10266-6821 6.8K  
R128 R228 A10266-1031 10K  
R129 R229 A10266-1041 100K  
R130 R230 A10266-1041 100K  
R131 R231 A10266-1031 10K  
U100 U200 C 6911-9  
U103 U203 C 6910-1  
U104 U204 C 6900-2  
UPA75 PNP  
UPA76 NPN  
MC34084P  
R132 R232 C 5062-2  
R133 R233 A10266-2741 270K  
R134 R234 A10266-1831 18K  
R135 R235 C 7782-3  
R136 R236 A10266-6821 6.8K  
100K TRIMMER  
MISC.  
BOARD  
J1  
J2  
J9  
D 6304B2  
C 7593-4  
C 4508-5  
C 7527-2  
C 7592-6  
C 7077-8  
5 PIN HEADER  
16 PIN SOCKET  
6 PIN HEADER  
4 PIN HEADER  
WIRE RETAINER  
PHONE JACK  
100 OHM  
R137 R237 C 7782-3  
100 OHM  
J10  
J11  
R138 R238 A10266-6821 6.8K  
R139 R239 A10266-1021 1K  
R140 R240 A10266-8201 82 OHM  
R141 R241 A10266-1541 150K  
R142 R242 A10266-1541 150K  
R146 R246 A10266-1031 10K  
R147 R247 C 7781-5  
R148 R248 A10266-2721 2.7K  
R149 R249 C 7781-5  
R150 R250 A10266-2721 2.7K  
R151 R251 A10266-1031 10K  
R152 R252 A10266-1231 12K  
R154 R254 A10266-1011 100 OHM  
R156 R256 A10266-1321 1.3K  
R157 R257 A10266-1321 1.3K  
R158 R258 A10266-9121 9.1K  
J100 J200 C 6777-4  
J500 J800 D 6619-7  
J600 J700 D 6620-5  
MOUNTS U1, U2:  
10" RIBBON ASSY  
6" RIBBON ASSY  
(2)  
(2)  
(2)  
(2)  
C 1889-2  
C 2176-3  
C 5341-0  
C 5594-4  
6-32 NUT  
6-32 X .5 SCREW  
HEATSINK  
200 OHM  
200 OHM  
STAR WASHER  
MOUNTS U104, U204:  
(2)  
C 3450-1  
14 Pin Socket  
COVERS FOR J100, J200:  
(2)  
Additional Parts  
(1)  
C 6778-2  
Cover, Phone Jack  
3-Cond Wire Retain  
C 7077-8  
30  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42682-7 Main Module Parts List (D 6910-0 Board)  
Q42682-7 Main Module (#2) for PB-1:  
DIODES  
D1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N4148  
1N4148  
1N3070  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N3070  
CAPACITORS  
D2  
D3  
D4  
D5  
D6  
D7  
C1  
C2  
C3  
C4  
C5  
C6  
C 4303-1  
C 3913-8  
C 4303-1  
C 6802-0  
OPEN  
1000uF  
470uF  
1000uF  
.47uF  
OPEN  
D104 D204 C 2851-1  
D105 D205 C 2851-1  
D106 D206 C 2851-1  
D107 D207 C 2851-1  
D108 D208 C 3181-2  
D109 D209 C 3181-2  
D110 D210 C 3181-2  
D111 D211 C 5061-4  
D112 D212 C 3181-2  
D113 D213 C 3181-2  
D114 D214 C 3181-2  
D115 D215 C 3181-2  
D120 D220 C 3181-2  
D121 D221 C 3181-2  
D122 D222 C 3181-2  
D123 D223 C 5061-4  
C100 C200 C 5311-3  
C101 C201 C 2820-6  
C103 C203 C 6805-3  
C104 C204 C 6805-3  
C105 C205 C 6812-9  
C106 C206 C 6812-9  
C108 C208 C 6814-5  
C112 C212 C 6803-8  
C113 C213 C 6802-0  
C114 C214 C 3729-8  
C115 C215 C 3729-8  
C116 C216 C 6802-0  
C117 C217 C 6803-8  
C118 C218 C 6814-5  
C122 C222 C 6811-1  
C123 C223 C 6812-9  
C124 C224 C 6812-9  
C125 C225 C 3729-8  
C127 C227 C 3729-8  
C128 C228 C 7706-2  
22uF  
5pF  
.022uF  
.022uF  
47pF  
47pF  
12pF  
.12uF  
.47uF  
100uF 16V  
100uF 16V  
.47uF  
.12uF  
12pF  
100pF  
47pF  
47pF  
100uF 16V  
100uF 16V  
.1uF  
NETWORK RESISTORS  
N100 N200 D 4669-4  
N101 N201 D 6081-0  
N102 N202 D 6082-8  
Balanced Input Trim  
Resistor Network-B  
Resistor Network-C  
C129  
C130  
OPEN  
C 6814-5  
12pF  
12pF  
TRANSISTORS  
C133 C233 C 6814-5  
C134 C234 C 6805-3  
C135 C235 C 6805-3  
C136 C236 C 6808-7  
C137 C237 C 6808-7  
C138 C238 C 6814-5  
C139 C239 C 6814-5  
C140 C240 C 6812-9  
C141 C241 C 6812-9  
C242 C 5162-0  
C144 C244 C 5362-6  
C145 C245 C 6814-5  
C146 C246 C 6809-5  
C147 C247 C 6806-1  
C148 C248 C 6810-3  
C149 C249 C 6808-7  
C150 C250 OPEN  
Q100 Q200 D 2961-7  
Q101 Q201 C 3578-9  
Q102 Q202 C 3810-6  
Q103 Q203 C 3786-8  
Q104 Q204 C 3625-8  
Q105 Q205 C 3578-9  
Q106 Q206 C 3625-8  
Q107 Q207 C 3786-8  
Q108 Q208 D 2961-7  
Q109 Q209 D 2961-7  
Q110 Q210 C 3810-6  
Q111 Q211 D 2961-7  
Q112 Q212 C 3625-8  
Q113 Q213 C 3625-8  
Q115 Q215 D 2962-5  
Q116 Q216 C 3786-8  
Q117 Q217 D 2961-7  
Q118 Q218 D 2961-7  
Q119 Q219 C 3625-8  
Q120 Q220 C 3625-8  
Q121 Q221 C 3786-8  
SEL 2N3859A  
MPSA93  
MPSA43/A42  
PN4250A  
2N4125  
MPSA93  
.022uF  
.022uF  
470pF  
470pF  
12pF  
12pF  
47pF  
47pF  
3-12pF Trim  
2.2uF  
12pF  
220pF  
.01uF  
180pF  
470pF  
2N4125  
PN4250A  
SEL 2N3859A  
SEL 2N3859A  
MPSA43/A42  
SEL 2N3859A  
2N4125  
2N4125  
MPS8097  
PN4250A  
SEL 2N3859A  
SEL 2N3859A  
2N4125  
2N4125  
PN4250A  
C151 C251 OPEN  
C152 C252 C 6809-5  
C153 C253 C 5362-6  
220pF  
2.2uF  
31  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42682-7 Main Module Parts List (D 6910-0 Board)  
R148 R248 A10266-2721 2.7K  
RESISTORS  
R149 R249 C 7781-5  
200 OHM  
R1  
R2  
R3  
R4  
R5  
R10  
A10265-53621 53.6K 1%  
OPEN  
OPEN  
A10265-46421 46.4K 1%  
A10266-3323 3.3K 1W  
OPEN  
R150 R250 A10266-2721 2.7K  
R151 R251 A10266-1031 10K  
R152 R252 A10266-1231 12K  
R153 R253 C 5869-2  
ZERO OHM  
R155 R255 OPEN  
R156 R256 A10266-1321 1.3K  
R157 R257 A10266-1321 1.3K  
R158 R258 A10266-9121 9.1K  
R159 R259 A10266-1031 10K  
R161 R261 A10266-4701 47 OHM  
R162 R262 A10266-4701 47 OHM  
R167 R267 A10266-1021 1K  
R168 R268 A10265-95301 953 OHM  
R169 R269 OPEN  
R170 R270 A10266-1021 1K  
R171 R271 A10265-95301 953 OHM  
R172 R272 OPEN  
R174 R274 A10265-38311 3.83K 1%  
R175 R275 A10265-24311 2.43K 1%  
R176 R276 A10266-1041 100K  
R100 R200 C 7409-3  
5K POT  
R101 R201 A10265-49911 4.99K  
R102 R202 A10266-1021 1K  
R103 R203 A10265-10031 100K 1%  
R104 R204 A10266-2721 2.7K  
R105 R205 A10266-2721 2.7K  
R106 R206 A10266-1231 12K  
R107 R207 A10266-6831 68K  
R108 R208 A10266-1021 1K  
R109 R209 A10266-8201 82 OHM  
R110 R210 A10266-6831 68K  
R111 R211 A10266-1231 12K  
R112 R212 A10266-5131 51K  
R113 R213 A10266-4721 4.7K  
R114 R214 A10266-4721 4.7K  
R115 R215 A10266-5141 510K  
R116 R216 A10266-3351 3.3M  
R117 R217 A10266-4731 47K  
R118 R218 A10266-2711 270 OHM  
R119 R219 A10266-3011 300 OHM  
R120 R220 A10266-2711 270 OHM  
R177 R277 C 5062-2  
TRIM POT  
R178 R278 A10266-1231 12K  
R179 R279 A10266-4731 47K  
R180 R280 A10266-4711 470 OHM  
R181 R281 A10266-4721 4.7K  
R182 R282 A10266-2201 22 OHM  
R183 R283 A10266-2051 2M  
R121 R221 C 5062-2  
100K TRIMMER  
R122 R222 A10266-2741 270K  
R123 R223 A10266-1831 18K  
R124 R224 A10266-6821 6.8K  
SWITCHES  
S3  
C 7363-2  
C 6781-6  
4PDT  
6P3T  
R125 R225 C 7782-3  
R126 R226 C 7782-3  
100 OHM  
100 OHM  
S100  
R127 R227 A10266-6821 6.8K  
R128 R228 A10266-1031 10K  
R129 R229 A10266-1041 100K  
R130 R230 A10266-1041 100K  
R131 R231 A10266-1031 10K  
IC’S  
U1  
U2  
C 5095-2  
C 5096-0  
MC7815  
MC7915  
UPA75 PNP  
UPA76 NPN  
MC34084P  
U100 U200 C 6911-9  
U103 U203 C 6910-1  
U104 U204 C 6900-2  
R132 R232 C 5062-2  
100K TRIMMER  
R133 R233 A10266-2741 270K  
R134 R234 A10266-1831 18K  
INTERCONNECTS  
J1  
J2  
J9  
J10  
J11  
J100 J200 C 6777-4  
J500 J800 D 6619-7  
J600 J700 D 6620-5  
R135 R235 C 7782-3  
100 OHM  
OPEN  
R136 R236 A10266-6821 6.8K  
C 4508-5  
C 7527-2  
C 7592-6  
C 7526-4  
16 PIN SOCKET  
6 PIN HEADER  
4 PIN HEADER  
3 PIN HEADER  
PHONE JACK  
R137 R237 C 7782-3  
100 OHM  
R138 R238 A10266-6821 6.8K  
R139 R239 A10266-1021 1K  
R140 R240 A10266-8201 82 OHM  
R141 R241 A10266-1541 150K  
R142 R242 A10266-1541 150K  
R146 R246 A10266-1031 10K  
10" RIBBON ASSY  
6" RIBBON ASSY  
R147 R247 C 7781-5  
200 OHM  
32  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42682-7 Main Module Parts List (D 6910-0 Board)  
MISC.  
BOARD  
D 6910-0  
MOUNTS U1, U2:  
(2)  
(2)  
(2)  
(2)  
C 1889-2  
6-32 NUT  
6-32 X .5 SCREW  
HEATSINK  
C 2176-3  
C 5341-0  
C 5594-4  
STAR WASHER  
MOUNTS U104, U204:  
(2)  
C 3450-1  
14 PIN SOCKET  
Phone Jack Cover  
CABLE TIE  
COVERS FOR J100, J200:  
(2)  
STRAIN RELIEF:  
(4) C 1811-6  
C 6778-2  
33  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42776-7 Main Module Parts List (D 7251-8 Board)  
Q42776-7 Main Module (3rd Gain) for PB-1:  
DIODES  
D1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 3181-2  
C 3549-0  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N916B 10V  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N4148  
1N4148  
1N3070  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N3070  
1N3070  
CAPACITORS  
D2  
D3  
D4  
D5  
D6  
D7  
D8  
D9  
C1  
C2  
C4  
C5  
C6  
C7  
C8  
C 3913-8  
C 3913-8  
C 6802-0  
C 6806-1  
C 6806-1  
C 6094-9  
C 6806-1  
470uF  
470uF  
.47uF  
.01uF  
.01uF  
33uF  
.01uF  
22uF  
5pF  
.022uF  
.1uF  
47pF  
47pF  
12pF  
.12uF  
.47uF  
100uF 35V  
100uF 35V  
.47uF  
.12uF  
12pF  
100pF  
47pF  
47pF  
100uF 35V  
100uF 35V  
.1uF 100V  
OPEN  
27pF  
C100 C200 C 5311-3  
C101 C201 C 2820-6  
C103 C203 C 6805-3  
C104 C204 C 6804-6  
C105 C205 C 6812-9  
C106 C206 C 6812-9  
C108 C208 C 6814-5  
C112 C212 C 6803-8  
C113 C213 C 6802-0  
C114 C214 C 8026-4  
C115 C215 C 8026-4  
C116 C216 C 6802-0  
C117 C217 C 6803-8  
C118 C218 C 6814-5  
C122 C222 C 6811-1  
C123 C223 C 6812-9  
C124 C224 C 6812-9  
C125 C225 C 8026-4  
C127 C227 C 8026-4  
C128 C228 C 7706-2  
C129 C229  
C130 C230 C 6813-7  
C133 C233 C 6814-5  
C134 C234 C 6805-3  
C135 C235 C 6805-3  
C136 C236 C 6808-7  
C137 C237 C 6808-7  
C138 C238 C 6814-5  
C139 C239 C 6814-5  
C140 C240 C 6812-9  
C141 C241 C 6812-9  
C144 C244 C 8026-4  
C145 C245 C 6814-5  
C146 C246 C 6809-5  
C147 C247 C 6806-1  
C148 C248 C 6810-3  
C 149 C249 C 6808-7  
C150 C250  
D104 D204 C 2851-1  
D105 D205 C 2851-1  
D106 D206 C 2851-1  
D107 D207 C 2851-1  
D108 D208 C 3181-2  
D109 D209 C 3181-2  
D110 D210 C 3181-2  
D111 D211 C 5061-4  
D112 D212 C 3181-2  
D113 D213 C 3181-2  
D114 D214 C 3181-2  
D115 D215 C 3181-2  
D120 D220 C 3181-2  
D121 D221 C 3181-2  
D122 D222 C 3181-2  
D123 D223 C 5061-4  
D124 D224 C 5061-4  
NETWORK RESISTORS  
N100 N200 D 4669-4  
N101 N201 D 6081-0  
N102 N202 D 6082-8  
Balanced Input Trim  
Resistor Network-B  
Resistor Network-C  
12pF  
.022uF  
.022uF  
470pF  
470pF  
12pF  
12pF  
47pF  
47pF  
100uF 35V  
12pF  
TRANSISTORS  
Q1  
Q2  
C 7458-0  
C 3625-8  
2N4123  
2N4125  
Q100 Q200 D 2961-7  
Q101 Q201 C 3578-9  
Q102 Q202 C 3810-6  
Q103 Q203 C 3786-8  
Q104 Q204 C 3625-8  
Q105 Q205 C 3578-9  
Q106 Q206 C 3625-8  
Q107 Q207 C 3786-8  
Q108 Q208 D 2961-7  
Q109 Q209 D 2961-7  
Q110 Q210 C 3810-6  
Q111 Q211 D 2961-7  
Q112 Q212 C 3625-8  
Q113 Q213 C 3625-8  
Q115 Q215 D 2962-5  
SEL 2N3859A  
MPSA93  
MPSA43/A42  
PN4250A  
2N4125  
MPSA93  
2N4125  
220pF  
.01uF  
PN4250A  
SEL 2N3859A  
SEL 2N3859A  
MPSA43/A42  
SEL 2N3859A  
2N4125  
180pF  
470pF  
OPEN  
OPEN  
220pF  
.1uF  
C151 C251  
C152 C252 C 6809-5  
C153 C253 C 6804-6  
2N4125  
MPS8097  
34  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42776-7 Main Module Parts List (D 7251-8 Board)  
Q116 Q216 C 3786-8  
Q117 Q217 D 2961-7  
Q118 Q218 D 2961-7  
Q119 Q219 C 3625-8  
Q120 Q220 C 3625-8  
Q121 Q221 C 7458-0  
Q122 Q222 C 7458-0  
PN4250A  
SEL 2N3859A  
SEL 2N3859A  
2N4125  
2N4125  
2N4123  
R133 R233 A10266-2741 270K  
R134 R234 A10266-1831 18K  
R135 R235 C 7782-3  
100 OHM  
R136 R236 A10266-6821 6.8K  
R137 R237 C 7782-3  
100 OHM  
R138 R238 A10266-6821 6.8K  
R139 R239 A10266-1021 1K  
R140 R240 A10266-8201 82 OHM  
R141 R241 A10266-1541 150K  
R142 R242 A10266-1541 150K  
R146 R246 A10266-1031 10K  
2N4123  
RESISTORS  
R1  
A10265-53621 53.6K  
A10266-2402 24 OHM  
R2  
R147 R247 C 7781-5  
200 OHM  
R3  
R4  
R5  
R11  
R12  
R13  
R14  
R15  
A10266-2402 24 OHM  
A10265-46421 46.4K  
A10266-3321 3.3K  
A10266-5621 5.6K  
A10266-4331 43K  
A10266-1021 1K  
A10266-8221 8.2K  
A10266-6211 620 OHM  
OPEN  
R148 R248 A10266-2721 2.7K  
R149 R249 C 7781-5  
200 OHM  
R150 R250 A10266-2721 2.7K  
R151 R251 A10266-1031 10K  
R152 R252 A10266-1231 12K  
R153 R253 C 5868-2  
ZERO OHM  
R156 R256 A10266-1321 1.3K  
R157 R257 A10266-1321 1.3K  
R158 R258 A10266-9121 9.1K  
R159 R259 A10266-1031 10K  
R161 R261 A10266-4701 47 OHM  
R162 R262 A10266-4701 47 OHM  
R167 R267 A10266-1021 1K  
R168 R268 A10265-95301 953 OHM  
R170 R270 A10266-1021 1K  
R171 R271 A10265-95301 953 OHM  
R174 R274 A10265-24921 24.9K  
R175 R275 A10265-14721 14.7K  
R176 R276 A10265-24921 24.9K  
R179 R279 A10266-4731 47K  
R180 R280 A10266-4711 470 OHM  
R181 R281 A10266-4721 4.7K  
R182 R282 A10266-2201 22 OHM  
R183 R283 A10266-2421 2.4K  
R185 R285 A10266-2421 2.4K  
R186 R286 A10266-1051 1M  
R187 R287 A10265-52321 52.3K  
R100 R200  
R101 R201 A10265-49911 4.99K  
R102 R202 A10266-1021 1K  
R103 R203 A10266-1041 100K  
R104 R204 A10266-2721 2.7K  
R105 R205 A10266-2721 2.7K  
R106 R206 A10266-1231 12K  
R107 R207 A10266-6831 68K  
R108 R208 A10266-1021 1K  
R109 R209 A10266-8201 82 OHM  
R110 R210 A10266-6831 68K  
R111 R211 A10266-1231 12K  
R112 R212 A10266-5131 51K  
R113 R213 A10266-4721 4.7K  
R114 R214 A10266-4721 4.7K  
R115 R215 A10266-5141 510K  
R116 R216 A10266-3351 3.3M  
R117 R217 A10266-4731 47K  
R118 R218 A10266-2711 270 OHM  
R119 R219 A10266-3011 300 OHM  
R120 R220 A10266-2711 270 OHM  
SWITCHES  
R121 R221 C 5062-2  
100K TRIMMER  
R122 R222 A10266-2741 270K  
R123 R223 A10266-1831 18K  
R124 R224 A10266-6821 6.8K  
S2  
C 7325-1  
C 7363-2  
C 6781-6  
DPDT SIDE  
DPDT GOLD  
6P3T  
S3  
S100  
R125 R225 C 7782-3  
R126 R226 C 7782-3  
100 OHM  
100 OHM  
IC’S  
U1  
U2  
R127 R227 A10266-6821 6.8K  
R128 R228 A10266-1031 10K  
R129 R229 A10266-1041 100K  
R130 R230 A10266-1041 100K  
R131 R231 A10266-1031 10K  
C 5095-2  
C 5096-0  
MC7815  
MC7915  
UPA75 PNP  
UPA76 NPN  
MC34084P  
U100 U200 C 6911-9  
U103 U203 C 6910-1  
U104 U204 C 6900-2  
R132 R232 C 5062-2  
100K TRIMMER  
35  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42776-7 Main Module Parts List (D 7251-8 Board)  
INTERCONNECTS  
J1  
C 7593-4  
C 4508-5  
C 7527-2  
C 7592-6  
C 7526-4  
HEADER 5 PIN  
16 PIN SOCKET  
HEADER 6 PIN  
HEADER 4 PIN  
HEADER 3 PIN  
PHONE JACK  
J2  
J9  
J10  
J11  
J100 J200 C 6777-4  
J500 J800 D 6619-7  
J600 J700 D 6620-5  
10" RIBBON ASSY  
6" RIBBON ASSY  
MISC.  
BOARD  
D 7251-8  
MOUNTS U1, U2:  
(2)  
(2)  
(2)  
(2)  
C 1889-2  
6-32 NUT  
6-32 X .5 SCREW  
HEATSINK  
C 2176-3  
C 5341-0  
C 5594-4  
STAR WASHER  
MOUNTS U104, U204:  
(2)  
C 3450-1  
14 PIN SOCKET  
Phone Jack Cover  
CABLE TIE  
COVERS FOR J100, J200:  
(2)  
STRAIN RELIEF:  
(4) C 1811-6  
C 6778-2  
Note: To use this module in the PB-1, it is necessary  
to remove R187/287 and install level control pots (C  
7409-3).  
36  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42953-2 Main Module Parts List (D 7251-8 Board)  
Q42953-2 PB-1 Main Module 3rd Gain Stage and Improved  
offset (Original 460CSL Main Module.):  
D2  
D3  
D4  
D5  
D6  
D7  
D8  
D9  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 3181-2  
C 3549-0  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N916B 10V Zener  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N4148  
1N4148  
1N3070  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N3070  
1N3070  
CAPACITORS  
C1  
C2  
C4  
C5  
C6  
C7  
C8  
C 3913-8  
C 3913-8  
C 6802-0  
C 6806-1  
C 6806-1  
C 6094-4  
C 6806-1  
470µF  
470µF  
.47µF  
.01µF  
.01µF  
33µF 16V  
.01µF  
22µF  
D104 D204 C 2851-1  
D105 D205 C 2851-1  
D106 D206 C 2851-1  
D107 D207 C 2851-1  
D108 D208 C 3181-2  
D109 D209 C 3181-2  
D110 D210 C 3181-2  
D111 D211 C 5061-4  
D112 D212 C 3181-2  
D113 D213 C 3181-2  
D114 D214 C 3181-2  
D115 D215 C 3181-2  
D120 D220 C 3181-2  
D121 D221 C 3181-2  
D122 D222 C 3181-2  
D123 D223 C 5061-4  
D124 D224 C 5061-4  
C100 C200 C 5311-3  
C101 C201 C 2820-6  
C103 C203 C 6805-3  
C104 C204 C 6804-6  
C105 C205 C 6812-9  
C106 C206 C 6812-9  
C108 C208 C 6814-5  
C112 C212 C 6803-8  
C113 C213 C 6802-0  
C114 C214 C 8876-8  
C115 C215 C 8876-8  
C116 C216 C 6802-0  
C117 C217 C 6803-8  
C118 C218 C 6814-5  
C122 C222 C 6811-1  
C123 C223 C 6811-1  
C124 C224 C 6812-9  
C127 C227 C 8576-8  
C128 C228 C 7706-2  
C130 C230 C 6813-7  
C133 C233 C 6814-5  
C134 C234 C 6805-3  
C135 C235 C 6805-3  
C136 C236 C 6808-7  
C137 C237 C 6808-7  
C138 C238 C 6814-5  
C139 C239 C 6814-5  
C140 C240 C 6812-9  
C141 C241 C 6812-9  
C144 C244 C 8576-8  
C145 C245 C 6814-5  
C146 C246 C 6809-5  
C147 C247 C 6806-1  
C148 C248 C 6810-3  
C149 C249 C 6808-7  
C152 C252 C 6809-5  
C153 C253 C 6804-6  
5pF  
.022µF  
.1µF  
47pF  
47pF  
12pF  
.12µF  
.47µF  
100µF 35V  
100µF 35V  
.47µF  
.12µF  
12pF  
100pF  
100pF  
47pF  
TRANSISTORS  
Q1  
Q2  
C 7458-0  
C 3625-8  
NPN 2N4123  
PNP 2N4125  
100pF  
.1µF  
27pF  
Q100 Q200 D 2961-7  
Q101 Q201 C 3578-9  
Q102 Q202 C 3810-6  
Q103 Q203 C 3786-8  
Q104 Q204 H43113-2  
Q105 Q205 C 3578-9  
Q106 Q206 C 3625-8  
Q107 Q207 C 3786-8  
Q108 Q208 D 2961-7  
Q109 Q209 D 2961-7  
Q110 Q210 C 3810-6  
Q111 Q211 H43113-2  
Q112 Q212 C 3625-8  
Q113 Q213 C 3625-8  
Q115 Q215 D 2962-5  
Q116 Q216 C 3786-8  
Q117 Q217 D 2961-7  
Q118 Q218 D 2961-7  
Q119 Q219 C 3625-8  
Q120 Q220 C 3625-8  
Q121 Q221 C 7458-0  
Q122 Q222 C 7458-0  
NPN 2N3859A SEL  
PNP MPSA93  
NPN MPSA43/A42  
PNP PN4250A  
Diode Pair  
12pF  
.022µF  
.022µF  
470pF  
470pF  
12pF  
12pF  
47pF  
47pF  
100µF 35V  
12pF  
220pF  
.01µF  
180pF  
470pF  
220pF  
.1µF  
PNP MPSA93  
PNP 2N4125  
PNP PN4250A  
NPN 2N3859A SEL  
NPN 2N3859A SEL  
NPN MPSA43/A42  
Diode Pair  
PNP 2N4125  
PNP 2N4125  
NPN MPS8097  
PNP PN4250A  
NPN 2N3859A SEL  
NPN 2N3859A SEL  
PNP 2N4125  
PNP 2N4125  
NPN 2N4123  
NPN 2N4123  
DIODES  
D1  
C 2851-1  
1N4004  
37  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42953-2 Main Module Parts List (D 7251-8 Board)  
R135 R235 A10266-1011 100  
RESISTORS  
R136 R236 A10266-6821 6.8K  
R137 R237 A10266-1011 100  
R138 R238 A10266-6821 6.8K  
R139 R239 A10266-1021 1K  
R140 R240 A10266-8201 82  
R141 R241 A10266-1541 150K  
R142 R242 A10266-1541 150K  
R146 R246 A10266-1031 10K  
N100 N200 D 4669-4  
N101 N201 D 6081-0  
N102 N202 D 6082-8  
CMR Trim Network  
Resistor Network  
Resistor Network  
R1  
A10265-53621 53.6K 1%  
R2  
R3  
C 7340-0  
C 7340-0  
24 5W  
24 5W  
R4  
R5  
A10265-46421 46.4K 1%  
A10266-3321 3.3K  
A10266-5621 5.6K  
A10266-4331 43K  
A10266-1021 1K  
R147 R247 C 7781-5  
200 .5W Flame Proof  
R11  
R12  
R13  
R14  
R15  
R148 R248 A10266-2721 2.7K  
R149 R249 C 7781-5  
200 .5W Flame Proof  
R150 R250 A10266-2721 2.7K  
R151 R251 A10266-1031 10K  
R152 R252 A10266-1231 12K  
A10266-8221 8.2K  
A10266-6211 620  
R100 R200 C 7409-3  
Pot, 5K Linear  
R153 R253 C 5868-2  
0 Ohm Jumper  
R101 R201 A10265-49911 4.99K 1%  
R102 R202 A10266-1021 1K  
R103 R203 A10265-10031 100K 1%  
R104 R204 A10266-2721 2.7K  
R105 R205 A10266-2721 2.7K  
R106 R206 A10266-1231 12K  
R107 R207 A10266-6831 68K  
R108 R208 A10266-1021 1K  
R109 R209 A10266-8201 82  
R110 R210 A10266-6831 68K  
R111 R211 A10266-1231 12K  
R112 R212 A10266-5131 51K  
R113 R213 A10266-4721 4.7K  
R114 R214 A10266-4721 4.7K  
R115 R215 A10266-5141 510K  
R116 R216 A10266-3351 3.3M  
R117 R217 A10266-4731 47K  
R156 R256 A10266-1321 1.3K  
R157 R257 A10266-1321 1.3K  
R158 R258 A10266-9131 9.1K  
R159 R259 A10266-5121 5.1K  
R161 R261 A10266-1011 100  
R162 R262 A10266-1011 100  
R167 R267 A10265-10011 1K 1%  
R168 R268 A10265-95301 953 1%  
R170 R270 A10265-10011 1K 1%  
R171 R271 A10265-95301 953 1%  
R174 R274 A10265-24921 24.9K 1%  
R175 R275 A10265-14721 14.7K 1%  
R176 R276 A10265-24921 24.9K 1%  
R179 R279 A10266-4731 47K  
R180 R280 A10266-4711 470  
R181 R281 A10266-4721 4.7K  
R182 R282 A10266-2201 22  
R183 R283 A10266-2421 2.4K  
R185 R285 A10266-2421 2.4K  
R186 R286 A10266-1051 1M  
R118 R218 C 7780-7  
270 Flame Proof  
R119 R219 A10266-3011 300  
R120 R220 C 7780-7  
R121 R221 C 5062-2  
270 Flame Proof  
100K Pot (–ODEP)  
R122 R222 A10266-2741 270K  
R123 R223 A10266-1832 18K .5W  
R124 R224 A10266-6821 6.8K  
R125 R225 A10266-1011 100  
R126 R226 A10266-1011 100  
R127 R227 A10266-6821 6.8K  
R128 R228 A10266-1031 10K  
R129 R229 A10266-1041 100K  
R130 R230 A10266-1041 100K  
R131 R231 A10266-1031 10K  
SWITCHES  
S2  
C 7325-1  
C 7363-2  
C 6781-6  
Ground Switch  
Sensitivity  
Stereo/Mono  
S3  
S100  
IC’S  
U1  
U2  
C 5095-2  
C 5096-0  
UA7815  
UA7915  
UPA75  
UPA76  
MC33084P  
U100 U200 C 6911-9  
U103 U203 C 6910-1  
U104 U204 C 6900-2  
R132 R232 C 5062-2  
100K Pot (+ODEP)  
R133 R233 A10266-2741 270K  
R134 R234 A10266-1832 18K .5W  
38  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q42953-2 Main Module Parts List (D 7251-8 Board)  
MISC.  
Board  
Socket  
Nut  
Heatsink  
Torq Sprdr  
Washer  
Screw  
J1  
J2  
J9  
J10  
J11  
D 7251-8  
C 3450-1  
A10102-5  
C 5341-0  
C 6541-4  
C 8973-7  
C 9067-7  
C 7593-4  
C 4508-5  
C 7527-2  
C 7592-6  
C 7526-4  
Blank PC Board  
14 Pin U104/204  
Hex 6-32  
TO-220  
#6, Split  
Stainless  
5 Pin Header  
16 Pin Socket  
6 Pin Header  
4 Pin Header  
3 Pin Header  
Phone Jack  
Phone Jack Cover  
10 Inch Ribbon  
6 Inch Ribbon  
J100 J200 C 6777-4  
Cover C 6778-2  
J500 J800 D 6619-7  
J600 J700 D 6620-5  
39  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q43060-5 Main Module Parts List (D 7993-5 Board)  
Q43060-5 Applicability: Main Module for Through Hole  
Chassis (THC) PB-1/460CSL units.  
C151 C251 C 6806-1  
C152 C252 C 6950-7  
C153 C253 C 8897-8  
C154 C254 C 8426-6  
C155 C255 C 8897-8  
C156 C256 C 8897-8  
C157 C257 C 6806-1  
.01µF  
82pF 5%  
.1µF  
.1µF 250V  
.1µF  
.1µF  
CAPACITORS  
C1  
C2  
C4  
C5  
C6  
C7  
C 4303-1  
C 3913-8  
C 6802-0  
C 6806-1  
C 6806-1  
C 8897-8  
1000µF  
470µF  
.47µF  
.01µF  
.01µF  
.1µF  
.01µF  
DIODES  
D1  
D2  
D3  
D4  
D5  
D6  
D7  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
C 2851-1  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4004  
1N4148  
1N4148  
1N4148  
1N3070  
1N4148  
1N4148  
1N4148  
1N4148  
1N4148  
1N3070  
1N4148  
1N4148  
1N3070  
1N3070  
1N4148  
1N4148  
1N4148  
1N4148  
C100 C200 C 5311-3  
C101 C201 C 2821-4  
C103 C203 C 6805-3  
C104 C204 C 6805-3  
C105 C205 C 6812-9  
C106 C206 C 6812-9  
C107 C207 C 8897-8  
C108 C208 C 6814-5  
C109 C209 C 7417-6  
C110 C210 C 5362-6  
C111 C211 C 8897-8  
C112 C212 C 6803-8  
C113 C213 C 8991-9  
C114 C214 C 8854-9  
C115 C215 C 8854-9  
C116 C216 C 8991-9  
C117 C217 C 6803-8  
C118 C218 C 6814-5  
C119 C219 C 6802-0  
C120 C220 C 8897-8  
C122 C222 C 6811-1  
C123 C223 C 6812-9  
C124 C224 C 6812-9  
C129 C229 C 6814-5  
C130 C230 C 6813-7  
C133 C233 C 6813-7  
C134 C234 C 6805-3  
C135 C235 C 6805-3  
C136 C236 C 6808-7  
C137 C237 C 6808-7  
C138 C238 C 6813-7  
C139 C239 C 6813-7  
C140 C240 C 6812-9  
C141 C241 C 6812-9  
C144 C244 C 8576-8  
C145 C245 C 6812-9  
C146 C246 C 6812-9  
C147 C247 C 6806-1  
C148 C248 C 6810-3  
C149 C249 C 6808-7  
C150 C250 C 6806-1  
22µF  
10pF  
.022µF  
.022µF  
47pF  
47pF  
.1µF  
12pF  
.0033µF  
2.2µF  
.1µF  
.12µF  
.47µF  
100µF  
100µF  
.47µF  
.12µF  
12pF  
.47µF  
.1µF  
100pF  
47pF  
47pF  
12pF  
D108 D208 C 3181-2  
D109 D209 C 3181-2  
D110 D210 C 3181-2  
D111 D211 C 5061-4  
D112 D212 C 3181-2  
D113 D213 C 3181-2  
D120 D220 C 3181-2  
D121 D221 C 3181-2  
D122 D222 C 3181-2  
D123 D223 C 5061-4  
D124 D224 C 3181-2  
D125 D225 C 3181-2  
D126 D226 C 5061-4  
D127 D227 C 5061-4  
D129 D229 C 3181-2  
D130 D230 C 3181-2  
D131 D231 C 3181-2  
D132 D232 C 3181-2  
27pF  
27pF  
TRANSISTORS  
.022µF  
.022µF  
470pF  
470pF  
27pF  
27pF  
47pF  
47pF  
100µF  
47pF  
Q100 Q200 D 2961-7  
Q101 Q201 C 3578-9  
Q102 Q202 C 3810-6  
Q103 Q203 C 3786-8  
Q105 Q205 C 3578-9  
Q106 Q206 C 3625-8  
Q107 Q207 C 3786-8  
Q108 Q208 D 2961-7  
Q109 Q209 D 2961-7  
Q110 Q210 C 3810-6  
Q112 Q212 C 3625-8  
Q113 Q213 C 3625-8  
Q115 Q215 D 2962-5  
Q116 Q216 C 3786-8  
Q117 Q217 D 2961-7  
Q118 Q218 D 2961-7  
NPN 2N3859A  
PNP MPSA93  
NPN MPSA43  
PNP PN4250  
PNP MPSA93  
NPN 2N4125  
PNP PN4250  
NPN 2N3859A  
NPN 2N3859A  
NPN MPSA43  
NPN 2N4125  
NPN 2N4125  
NPN MPS8097  
PNP PN4250  
NPN 2N3859A  
NPN 2N3859A  
47pF  
.01µF  
180pF  
470pF  
.01µF  
40  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q43060-5 Main Module Parts List (D 7993-5 Board)  
Q119 Q219 C 3625-8  
Q120 Q220 C 3625-8  
Q121 Q221 C 7458-0  
Q122 Q222 C 7458-0  
Q123 Q223 C 7458-0  
Q124 Q224 C 3625-8  
NPN 2N4125  
NPN 2N4125  
NPN 2N4123  
NPN 2N4123  
NPN 2N4123  
NPN 2N4125  
R136 R236 A10266-6821 6.8K  
R137 R237 C 7782-3  
100 Flame Proof  
R138 R238 A10266-6821 6.8K  
R139 R239 A10266-8211 820  
R140 R240 A10266-6801 68  
R141 R241 A10266-1541 150K  
R142 R242 A10266-1541 150K  
R143 R243 A10266-1041 100K  
R144 R244 A10266-1041 100K  
R145 R245 A10266-1851 1.8M  
R146 R246 A10266-1031 10K  
RESISTORS  
N101 N201 D 6081-0  
N102 N202 D 6082-8  
Network Package  
Network Package  
R1  
A10265-53621 53.6K 1%  
R147 R247 C 7781-5  
200 .5W Flame Proof  
R2  
R3  
C 7340-0  
C 7340-0  
24 5W  
24 5W  
R148 R248 A10266-2721 2.7K  
R149 R249 C 7781-5  
200 .5W Flame Proof  
R4  
R5  
R7  
R8  
A10265-46421 46.4K 1%  
A10266-3321 3.3K  
A10266-1041 100K  
A10266-2031 20K  
A10266-5121 5.1K  
A10266-5121 5.1K  
A10266-2031 20K  
A10266-1041 100K  
R150 R250 A10266-2721 2.7K  
R151 R251 A10266-1031 10K  
R152 R252 A10266-1231 12K  
R153 R253 JUMPER  
R154 R254 C 8261-7  
JUMPER  
121K 0.1%  
R9  
R16  
R17  
R18  
R155 R255 A10266-1321 1.3K  
R156 R256 A10266-1321 1.3K  
R157 R257 A10266-1321 1.3K  
R158 R258 A10266-9121 9.1K  
R159 R259 A10266-1021 1K  
R100 R200 C 7409-3  
5KLinearPot(Level)  
R101 R201 A10265-49911 4.99K 1%  
R102 R202 A10266-5111 510  
R103 R203 A10265-10031 100K 1%  
R104 R204 A10266-2721 2.7K  
R105 R205 A10266-2721 2.7K  
R106 R206 A10266-1231 12K  
R107 R207 A10266-6831 68K  
R108 R208 A10266-8211 820  
R109 R209 A10266-6801 68  
R110 R210 A10266-6831 68K  
R111 R211 A10266-1231 12K  
R113 R213 A10266-4721 4.7K  
R160 R260 C 8260-9  
10K 0.1%  
R161 R261 A10266-1011 100  
R162 R262 A10266-1011 100  
R163 R263 C 8261-7  
R164 R264 C 8260-9  
R165 R265 C 8261-7  
121K 0.1%  
10K 0.1%  
121K 0.1%  
R166 R266 A10266-1851 1.8M  
R167 R267 A10265-10011 1K 1%  
R168 R268 A10265-95301 953 1%  
R170 R270 A10265-10011 1K 1%  
R171 R271 A10265-95301 953 1%  
R118 R218 C 7780-7  
R119 R219 A10266-3011 300  
270 Flame Proof  
R173 R273 C 8260-9  
10K 0.1%  
R174 R274 A10265-24921 24.9K 1%  
R175 R275 A10265-14721 14.7K 1%  
R176 R276 A10265-24921 24.9K 1%  
R177 R277 A10265-54921 54.9K 1%  
R179 R279 A10266-1321 1.3K  
R180 R280 A10266-4711 470  
R181 R281 A10266-4721 4.7K  
R182 R282 A10266-2201 22  
R183 R283 A10266-2421 2.4K  
R184 R284 A10266-4741 470K  
R185 R285 A10266-2421 2.4K  
R186 R286 A10266-2751 2.7M  
R187 R287 A10266-3631 36K  
R188 R288 A10266-3631 36K  
R189 R289 A10266-2731 27K  
R190 R290 A10266-2051 2M  
R120 R220 C 7780-7  
R121 R221 C 5062-2  
R122 R222 A10266-2741 270K  
R123 R223 A10266-1832 18K .5W  
R124 R224 A10266-6821 6.8K  
270 Flame Proof  
100K Pot (-ODEP)  
R125 R225 C 7782-3  
R126 R226 C 7782-3  
100 Flame Proof  
100 Flame Proof  
R127 R227 A10266-6821 6.8K  
R128 R228 A10266-1031 10K  
R129 R229 A10266-1041 100K  
R130 R230 A10266-1041 100K  
R131 R231 A10266-1031 10K  
R132 R232 C 5062-2  
R133 R233 A10266-2741 270K  
R134 R234 A10266-1832 18K .5W  
100K Pot (+ODEP)  
R135 R235 C 7782-3  
100 Flame Proof  
41  
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Power Base-1 & 460CSL Amplifier Service Manual  
Q43060-5 Main Module Parts List (D 7993-5 Board)  
R191 R291 A10266-3331 33K  
IC’S  
U1  
U2  
R192 R292 A10266-1031 10K  
R193 R293 A10266-1031 10K  
R194 R294 A10266-1041 100K  
R195 R295 A10266-3021 3K  
R196 R296 A10266-4721 4.7K  
R197 R297 A10266-1031 10K  
R198 R298 A10266-4721 4.7K  
R199 R299 A10266-1031 10K  
R909 R1009 A10266-4741 470K  
R910 R1010 A10266-4741 470K  
R911 R1011 A10266-1521 1.5K  
R912 R1012 A10266-4711 470  
R913 R1013 A10266-1051 1M  
R915 R1015 A10266-1001 10  
R916 R1016 A10266-1001 10  
R917 R1017 A10266-10021 10K  
R918 R1018 A10266-10021 10K  
R919 R1019 A10266-10021 10K  
R920 R1020 A10266-10021 10K  
C 5095-2  
C 5096-0  
UA7815  
UA7915  
UPA75  
LM339  
LM339  
U100 U200 C 6911-9  
U101 U201 C 4345-2  
U102 U202 C 4345-2  
U103 U203 C 6910-1  
U104 U204 C 7558-7  
UPA76  
MC33079P  
MISC.  
Board  
Socket  
Nut  
Heatsink  
Torq. Spreader C 6541-4  
Washer  
Screw  
J1  
J11  
J12  
D 7993-5  
C 3450-1  
A10102-5  
C 5341-0  
14 Pin  
Hex 6-32  
TO-220  
C 8973-7  
C 9067-7  
C 7593-4  
C 7526-4  
C 7873-0  
#6, Split  
Stainless  
5 Pin Header  
3 Pin Header  
2 Pin Header  
Phone Jack  
Phone Jack Cover  
10 Inch Ribbon  
6 Inch Ribbon  
R921 R1021 C 9079-2  
200 Pot (CMR Null)  
J100 J200 C 6777-4  
Cover C 6778-2  
J500 J800 D 6619-7  
J600 J700 D 6620-5  
SWITCHES  
S2  
S3  
S4  
C 7325-1  
C 7960-5  
C 6781-6  
Ground Lift  
Sensitivity  
Stereo/Mono  
42  
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