Manley Labs Stereo Amplifier 75 150 SE PP 807 MONOBLOCK User Manual

MANLEY  
LABORATORIES, INC.  
OWNER'S MANUAL  
75 / 150 SE / PP  
807 MONOBLOCK  
MANLEY LABORATORIES, INC.  
13880 MAGNOLIA AVE.  
CHINO, CA. 91710  
TEL: (909) 627-4256  
FAX: (909) 628-2482  
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INTRODUCTION  
THANK YOU!...  
for choosing the Manley 75 / 150 SE / PP 807 MONOBLOCK Amplifiers. Designed by David Manley, the 807  
MONOBLOCK Amplifiers use only the best available components, with the shortest and cleanest signal path  
possible. These amps have the exclusive Manley ability to switch from Single ended to Push-Pull topologies. This  
amp is designed to provide our customers with a the unique combination of single ended triode topology, solid  
power and remarkable specs. This includes flat frequency response, low distortion and optimum damping factor  
that are uncommon for single ended designs. In Push-Pull mode there is more of everything - double the power  
(150 watts), extended frequency response, and higher damping factor.  
Let us start out by stating our opinions about amplifier topologies. Historically, we have been manufacturing very  
highly regarded tube amplifiers since before tubes were considered the best option for hi-fi music reproduction.  
We have manufactured a very wide range of amplifiers with power ranging from 18 watts to 1000 watts and with  
a corresponding variety of tubes. This is not our first amp to feature 807's nor our first single ended triode amp.  
We build a $15,000 25 watt single ended amp on a custom basis. In our experience, the more power an amplifier  
is capable of - the better it will be at providing acceptable low frequency quality. It is not easy to produce a very  
powerful amp with highs with the same quality as the lows. To do that we had to start manufacturing our own  
transformers. This is the major development that allowed us to produce an amplifier that could switch from  
single-ended to push-pull. We had to design and build a very unusual transformer first.  
When several other manufacturers started selling single-ended amps with 5 to 9 watts of power, we understood  
subjectively and objectively the good part of the story - the superb mid range - the delicate transient detail - the  
inherent simplicity. The bad news was that there were almost no speakers efficient enough to be a dynamic viable  
system. The worst news was that either these single-ended amps cost more than the condo and/or they had specs  
that could only be a joke. As the triode fans increased, more efficient speakers became available and several  
fanatics began to dismiss push-pull as a bad thing to be avoided at all costs. We objected to such blanket  
generalities and stressed that the push-pull done right with truly balanced transformers, quality parts throughout  
and well designed circuitry has proven to be a superb technique. We also like single ended amps, but only when it  
is done right, mostly because we demand flat frequency response and low distortion out of an amplifier.  
We set out to design an amplifier that would appeal to us and to you and to the critics. It would be single-ended  
but with more power than most single ended amps. It would be switchable to push-pull for fans of that school and  
for those who want it both ways - to compare for themselves, and to use each mode depending on the music. This  
was the SE / PP 300B amplifiers. We recieved such great response to it that we followed it up with this 8 X 807  
based gem that would appeal to people who need reasonable power for their speakers (average sensitivity) and  
listening levels (including rock). Up to now, they have had no option of using single ended triodes without trading  
in their favorite speakers. We are proud of these amplifiers and have been featuring them at hi-fi trade shows and  
exhibitions.  
There are other benefits to being an owner of an 807 based amplifier. A prime advantage is that these tubes are  
some of the most reliable we have experienced - plus these tubes are readily available and not extremely costly.  
These amplifiers have a highly polished look thanks to the gold and chrome finishes. These new metal  
technologies were not available a few years ago. Built to last a lifetime. Designed to look elegant. Engineered by  
David Manley who happens to love music enough to be his lifes career.  
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READ THIS PAGE BEFORE YOU SET UP THE AMPS, PLEASE  
IMPORTANT Never operate this amp without a speaker or load connected. Never drive this amp into a short  
circuit. Most solid state amps can be operated without a load or speaker and some can drive a short circuit because of  
protection circuitry. These are different - Like most tube amps the output power is less affected by changing the load  
impedance within the range of 4 to 16 ohms, however extremes like a short or open circuit are to be avoided. The result  
could be damage to transformers, tubes. The warranty does not cover this damage if it occurs.  
LOCATION & VENTILATION  
IMPORTANT - PLEASE PROVIDE A SAFE LOCATION, SUCH AS A LOCKED  
CABINET, IF THERE ARE CHILDREN OR PETS IN THE HOME.  
At the top of the 807 tubes is a ceramic connector. This connector typically carries 630 VOLTS DC when the amplifier  
is on and afterwards until the power supply discharges. With all the tubes in this is typically 30 seconds.  
If you have small children or pets, you should consider placing the amplifiers out of reach to prevent damage to the  
amplifier or damage to your small children or pets.While these end caps provide sufficient insulation while attached to  
the tube - there is a shock hazard if they are removed and children can remove them. Manley Labs can supply an optional  
"Cover" for these amps if needed.  
Besides the high voltage, there is another hazard - HEAT. A child, spouse or pet could get a mild burn by touching a hot  
tube. Tubes produce heat but not as much as a light bulb. Most people do not put exposed light bulbs on the floor but  
many audiophiles do put tube amplifiers on the floor. Beware that it may be possible to step on an amplifier in the dark  
or trip on a cable and fall on one. Shades of "Help! I've fallen and can't get up!". The other thing to be aware of is poor  
ventilation if the amp is on a carpet. There is ventilation holes in the bottom of the chassis that are essential for the long  
and healthy life of the amp. Ventilation is also important if they are put in a cabinet with a door. Allow a minimum of 2  
inches of clearance on the top and sides of the amplifiers, such that a constant flow of air can flow. Do not place  
amplifiers directly on high pile carpet or any other surface that will block the ventilation vents underneath the  
amplifiers.  
Isolation from vibration is worth considering because this will help to reduce tube microphonic noise and very likely  
allow the maximum sonic potential that these amps are capable of. Lastly, be aware that some equipment can radiate a  
strong electromagnetic field. Hum and noise problems are often cured by avoiding stacking electroic gear on top of each  
other. Distance helps greatly.  
GENERAL NOTES  
WATER & MOISTURE  
As with any electrical equipment, these amplifiers should not be used near water or moisture. If liquid enters the  
amplifier, it must be immediately returned to your dealer for servicing.  
SERVICING  
The user should not attempt to service the amplifier beyond that described in the owner's manual. Refer all servicing  
other than biasing and tube replacement to Manley Laboratories  
SPECIAL NOTES  
Before turning the amps on - Connect your preamp to the amp inputs. Tubes may become loose during transit.  
Straighten and press down each tube before plugging the amplifier into the mains socket. Once connections are secure  
turn the preamp on, wait a minute, turn the power amps on last. Always turn the amplifiers off first, then other gear. This  
prevents damage to equipment - particularily speakers. Furthermore, do not touch the tubes after the amplifier has been  
switched on, as the tubes become very hot during operation and should only be handled after the power has been turned  
off and the tubes have cooled.  
WARNING!  
TO PREVENT THE RISK OF ELECTRIC SHOCK DO NOT OPEN THE CABINET.  
REFER SERVICING TO QUALIFIED PERSONEL.  
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MAINS CONNECTIONS  
Your amplifier has been factory set to the correct mains voltage for your country. The voltage  
setting is marked on the serial badge, located on the rear panel. Check that this complies with  
your local supply.  
Export units for certain markets have a moulded mains plug fitted to comply with local  
requirements. If your unit does not have a plug fitted the coloured wires should be connected  
to the appropriate plug terminals in accordance with the following code.  
GREEN/YELLOW  
BLUE  
BROWN  
EARTH  
NEUTRAL terminal  
LIVE terminal  
terminal  
As the colours of the wires in the mains lead may not correspond with the coloured marking  
identifying the terminals in your plug proceed as follows;  
The wire which is coloured GREEN/YELLOW must be connected to the terminal in the plug  
which is marked by the letter E or by the safety earth symbol or coloured GREEN or GREEN  
and YELLOW.  
The wire which is coloured BLUE must be connected to the terminal in the plug which is  
marked by the letter N or coloured BLACK.  
The wire which is coloured BROWN must be connected to the terminal in the plug which is  
marked by the letter L or coloured RED.  
DO NOT CONNECT/SWITCH ON THE MAINS SUPPLY UNTIL ALL OTHER  
CONNECTIONS HAVE BEEN MADE.  
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CONNECTING YOUR AMPLIFIER  
Setting up your amplifiers is rather easy.  
1. Connect all source components (turntable, CD, Tuner, Tape DAT, etc.) to  
your preamplifier or switching center.  
2. Connect the interconnects from the output of the preamplifier to the RCA input  
on the top rear of the amplifiers.  
3. Connect the hot or "+" speaker cable to the red binding post and the common or  
"-" speaker cable to the black binding post (See diagarm 2). Ensure that the other  
end of the cable is connected correctly to the speaker. Tighten the binding posts  
by hand. If you use a nut-driver (3/8") do not over-tighten the posts or you may  
break the connections inside the amplifier.  
4. Ensure that the "mains" switch on the front panel is in the "off" or "0" position. If  
the 807s are not inserted - do it now - .  
5. Turn on Preamplifier and any source components you plan to use.  
6. Plug Amplifiers into wall outlets.  
7. Set both amps up at the same SE or PP settings. SE is a good place to start.  
8. Switch the square mains power switch to the ON or "1" position and allow the  
amplifier a minute or so to 'warm up'. The glowing panel and glowing tubes will  
indicate that the amplifier is on.  
9. Turn up the volume on the preamp and enjoy. If something is "humming" don't  
panic. All you need to do is use a "3 pin to 2 pin AC adapter" or "cheater". The  
problem is too many grounds - you should only have one. Check out the next  
section for help with hum.  
10. Now, while music is playing, try switching to PUSH / PULL. The difference  
may or may not be subtle. Choose the mode you like best with this music. There  
may be a distressing "click" as you switch - this is normal.  
GROUNDING and POWER:  
In the event of HUM we suggest that you alter the ground scheme. Electronic gear  
often has 3 pin grounds for safety reasons and international regulations. Unfortu-  
nately audio equipment is also prone to sensitivity to ground loops. The usual  
cure is to use 3 pin to 2 pin AC adapters availble at most hardware stores for  
about a dollar. Do not break off the AC ground pin.  
With the power off, try an adapter on ONE of the amps. If you have other units such  
as preamps or CD players with 3 pin AC plugs, use adapters here as well. The  
goal is to have ONLY ONE piece of equipment connected to AC ground via AC  
plugs. Other gear is grounded via the RCA interconnects. Only after all connec-  
tions have been made should you turn on the power with the amplifiers being last  
on and first off always.  
A different alternative is to ground the preamp and to use adapters on every other  
piece of gear with 3 pin AC plugs. Alas, few preamps have AC ground pins.  
A third alternative is to use "balanced AC" (60-0-60) transformers to power all the  
equipment. The latest revision of the USA electrical codes allows this as a "legal"  
technique. It works very well at reducing many types of noise 10 to 15 dB.  
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MANLEY 75 / 150 SE / PP 807 TRIODE MONOBLOCK  
B
E
C D  
A
F
G
M
1 2 3 4  
5 6 7 8  
H
5
H
2
H
7
H
4
J
H
6
H
1
H
8
H
3
I
1
2
3
4
N
5
6
7
8
K
Amplifier Overhead View  
L
A
B
C
D
E
F
G
H
I
RCA Input Jack  
Speaker Terminals  
B PLUS FUSE - Replace only with same type and value (MDL 1.5)  
Mains fuse - Replace only with same type and value  
IEC Mains socket  
Output Transformer  
Power Transformer  
Power Tube 807 s  
Input Tube 5751  
J
Driver Tube 7044  
K
L
M
N
Single-Ended / Push- Pull Switch  
Power Switch  
Bias Adjustment Trimmers (each 807 has a trim and test point numbered)  
Bias Test Points (Black test point is Ground)  
REPLACING FUSES & LAMPS  
The fuses are accessable without removing any panels. Be sure the IEC AC power cable is  
removed before checking the Mains Fuse. Often a bad fuse will look blackened internally but  
occasionally will look OK. Replace only with the same type and rating ! For 100 or 120 volt countries  
the fuse should be a 10 AMP SLO-BLO. For 220 or 240 volt countries it should be 5 AMP SLO-BLO.  
If a new fuse blows then it is likely there is another problem. Remove the 807s and try again. If the  
indicator lights, then a tube is bad. At least one of them is the problem.If the fuse blew again - The  
amplifier needs to be repaired by a competent technician or the factory.  
Before removing the B+ Fuse let the power supply fully discharge - this will take at least 1  
minute. The cap is removed with a proper sized screwdriver and 1/4 turn anti-clockwise while gently  
pressing down.The B+ Fuse we use is ceramic and not able to be visually checked - a VOM meter is  
needed. The symtom will be - lit indicators and glowing tubes but no sound.  
The indicator is a fuse style lamp 1.25" X .25", 8 volt, 0.3 amp. The bottom must be removed  
to access the lamp. Again, wait until the supply discharges.  
BIAS ADJUSTMENT TRIMMERS  
See the next page for full details - Read the voltage between the black test point and  
each of the numbered red points. If the reading is not 0.340 volts or 340 mV then adjust the  
corresponding numbered trimmer.  
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OPERATIONAL NOTES  
SWITCHING SINGLE-ENDED 75 / PUSH-PULL 150 This amplifier has a feature exclusive to  
Manley Labs of being able to choose between two circuit topologies. You are able to switch  
between each mode while the amplifier is turned on and playing music. In SINGLE-ENDED mode  
the amplifier uses eight 807s in parallel. The advantage is a minimalist circuit requiring no "phase  
splitter",The disadvantage is a less efficient circuit that produces half the power of PUSH-PULL. In  
PUSH-PULL mode each tube works in opposite phase to the other and relies on the output  
transformer to make the polarities work together. This has advantages in efficiency and in the  
distortion and noise cancellation properties of a balanced circuit. Both ways are operated in "Class  
A" bias throughout and both are PURE TRIODE and both modes have a similar short signal path.  
ADJUSTING BIAS  
The amplifier has been factory adjusted and should not need adjustment more than once a month.  
This does more for tube life than it does for sound quality. You will need a DC voltmeter and a  
small flat screwdriver. This should be checked every few months but does not need to be  
necessarily adjusted unless an 807 pwer tube is replaced. Checking verifies that each tube is stable  
and operating properly. It may be the first hint that a tube is needing replacement.  
1) Let the amp warm up in SINGLE-ENDED mode for about an hour, then with no music  
playing.... Set the volt meter to a low DC range such as 1 or 2 volts DC.  
2) Put negative or black probe of the voltmeter to the black test point (ground),front and center of  
the amplifier and the red or positive probe in the small red socket most left front near the 807s. See  
the diagram on the previous page that indicates which test point and trimmer relates to which tube.  
3) The meter should read 340 mV or 0.34 volts DC. If not -then you can adjust the trimmer  
without opening the chassis. It is located in the hole near the transformer and is blue. Adjust it  
gently and fairly slowly. A little "drift" is normal.  
4) Now check and/or adjust the other tube's bias. Use the next right red probe socket and the next  
right trimmer and adjust the same way. Continue for all 8 power tubes.  
5) You may want to re-check each tube's test point and re-adjust if needed. There may be some  
small interaction - particularly if a tube was replaced.  
TUBE LIFE  
You should expect many years of life from the tubes in your MANLEY SE / PP if you adhere to  
the procedures described above and check your bias at least once every 2-3 months. We stock all  
the tubes in these amplifiers should you ever need replacements (and at very reasonable prices too!)  
FUSES  
The fuses used in your amplifier are standard 1/4" x 1 1/4" SLO-BLO types. The correctly rated  
fuse has been installed at the factory for your country's voltage. If replacing a fuse, always unplug  
the amplifier's power cord from the wall outlet and always use the exact same type and ampere  
rating fuse as the one you are replacing. Failure to do so will void your warranty and can be a  
dangerous fire hazard. For 120 volts the correct fuses are MDL10 for the mains. For 240  
volts the correct fuses are MDL5 for the mains.  
INDICATOR LAMP  
The lamp is a 1/4" X 1 1/4" fuse style rated at 8 volts and 0.3 amps. Power should be disconnected,  
the power supply discharged (1 minute). The bottom panel will have to be removed, The lamp is  
clearly accessable directly behind the semi-translucent Manley logo panel. Gently pry out one end  
to remove the lamp for replacement.  
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SPECIFICATIONS  
Vacuum Tubes:  
8 x 807 (Output), 1 x 7044 (Driver),  
1 x 5751 (Input)  
Output Power @ 3% THD  
SINGLE-ENDED: - 72 Watts  
PUSH-PULL: - 150 Watts  
Frequency Response +/- 1 dB  
(measured at 5 watts)  
SINGLE-ENDED: 18 Hz - 20 KHz  
PUSH-PULL: 10 Hz - 50 KHz  
1 V nominal  
Input Sensitivity  
Input Impedance  
Load Impedance  
40 KOhm  
4 to 12 Ohm appropriate for 4 & 8 ohm speakers  
12 to 20 Ohm appropriate for 16 ohm speakers  
S/N ratio @ 33 watts  
Power Consumption  
Mains Fuse  
Typically 86 dB or a -76 db noise floor 10Hz-30K  
250 Watts  
100, 110, 120V  
220, 240 V  
10 A (Slo-Blo)  
5 A (Slo-Blo)  
Lamp  
1/4 X 1 1/4 Fuse lamp - 8 volt, 0.3 amp  
W=19", D=13", H=8" inches  
75 lbs EACH  
Dimensions  
Shipping Weight  
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WARRANTY  
All Manley Laboratories equipment is covered by a limited warranty against defects in materials  
andworkmanshipforaperiodof90daysfromdateofpurchasetotheoriginalpurchaseronly.A  
furtheroptionallimited5yearwarrantyisavailabletotheoriginalpurchaseruponproper  
registrationofownershipwithin30daysofdateoffirstpurchase.  
Properregistrationismadebyfillingoutandreturningtothefactorythewarrantycardattachedto  
this general warranty statement, along with a copy of the original sales receipt as proof of the  
originaldateofpurchase. Only1cardisissuedwitheachunit, andtheserialnumberisalready  
recordedonit.  
Ifthewarrantyregistrationcardhasalreadybeenremovedthenthisisnotanewunit, andis  
therefore not warranted by the factory. If you believe this to be a new unit then please contact the  
factorywiththedetailsofpurchase.  
Thiswarrantyisprovidedbythedealerwheretheunitwaspurchased,andbyManleyLaboratories,  
Inc. Underthetermsofthewarrantydefectivepartswillberepairedorreplacedwithoutcharge,  
exceptingthecostoftubes.Nowarrantyisofferedontubes,unless:  
1.aManleyLaboratoriespreamplifierisusedwithaManleyLaboratories amplifier,and  
2. thewarrantyregistrationcardisfilledout.  
In such a case a 6 month warranty on tubes is available with the correct recording of the serial  
numberofthepreamplifieronyourwarrantyregistrationcard.  
IfaManleyLaboratories productfailstomeettheabovewarranty,thenthepurchaser'ssole  
remedyshallbetoreturntheproducttoManleyLaboratories, wherethedefectwillberepaired  
withoutchargeforpartsandlabour.Theproductwillthenbereturnedviaprepaid,insuredfreight,  
methodandcarriertobedeterminedsolelybyManleyLaboratories.Allreturnstothefactorymust  
beintheoriginalpacking,(newpackingwillbesuppliedfornochargeifneeded),accompaniedby  
awrittendescriptionofthedefect,andmustbeshippedtoManleyLaboratoriesviainsuredfreight  
atthecustomer'sownexpense.Chargesforunauthorizedserviceandtransportationcostsarenot  
reimbursableunderthiswarranty,andallwarrantees,expressorimplied,becomenullandvoid  
wheretheproducthasbeendamagedbymisuse,accident,neglect,modification,tamperingor  
unauthorizedalterationbyanyoneotherthanManleyLaboratories.  
Thewarrantorassumesnoliabilityforpropertydamageoranyotherincidentalorconsequental  
damagewhatsoeverwhichmayresultfromfailureofthisproduct.Anyandallwarranteesof  
merchantabilityandfitnessimpliedbylawarelimitedtothedurationoftheexpressedwarranty.  
AllwarranteesapplyonlytoManleyLaboratoriesproductspurchasedandusedintheUSA.  
Somestatesdonotallowlimitationsonhowlonganimpliedwarrantylasts, sotheabove  
limitations may not apply to you. Some states do not allow the exclusion or limitation of incidental  
orconsequentialdamges,sotheaboveexclusionmaynotapplytoyou.  
Thiswarrantygivesyouspecificlegalrightsandyoumayalsohaveotherrightswhichvaryfrom  
state to state.  
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WARRANTYREGISTRATION  
We ask that you please fill out this registration form and send the bottom half to:  
MANLEY LABORATORIES  
REGISTRATION DEPARTMENT  
13880 MAGNOLIA AVE.  
CHINO CA, 91710  
Registration entitles you to product support, full warranty benefits, and notice of product  
enhancements and upgrades. You MUST complete and return the following to validate your  
warranty and registration. Thank you again for choosing Manley Laboratories.  
MODEL ____________________ SERIAL No. ______________________  
PURCHASE DATE ______________ SUPPLIER ______________________  
---------------------------------------------------------------------------------------------------  
PLEASE DETACH THIS PORTION AND SEND IT TO MANLEY LABORATORIES  
MODEL: MANLEY SE / PP 300B MONOBLOCK  
SERIAL No. ______________________________  
PURCHASE DATE ______________ SUPPLIER _______________________  
NAME OF OWNER _______________________________________________  
ADDRESS ______________________________________________________  
CITY, STATE, ZIP________________________________________________  
TELEPHONE NUMBER ___________________________________________  
Comments???? ___________________________________________________  
________________________________________________________________  
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