Cary Audio Design Stereo Amplifier SLP 88 User Manual

SLP-88 Vacuum Tube Stereo  
Preamplifier  
Operation and Installation Manual  
Please read this manual carefully before installing your new SLP-88 into your stereo  
system. It contains important set up and installation information as well as safety  
warnings regarding AC voltage inside the chassis.  
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Cary Audio Design SLP-88 Preamplifier Operations Manual  
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SPECIFICATIONS: SLP-88  
Dimensions: 16” W x 5” H x 12” D  
Weight: 15 lb..  
Circuit: Class A Triode  
Input Impedance: 100,000 (100K) ohms resistive  
Output Impedance: 680 ohms  
Gain: 20 dB  
Signal/Noise Level: -88 dB  
Resistors: 1 % metal film  
Capacitors: Film and foil output caps, 5 micro farad (5 mFd)  
Power Transformer: 200% continuous commercial duty cycle  
Tubes: 2- 6SN7 dual triodes  
Power Supply: Full wave rectification, center-tapped, pi-network with filter choke, fully  
regulated  
AC  
Power Requirements: 100 – 130 volts AC / 50-60 Hz at 24 watts  
200 – 245 volts AC / 50-60 Hz at 24 watts  
Wire: EE Teflon Silver  
Warm-up Time: 5 minutes (2 minute auto mute)  
Input and  
Output Jacks: Gold plated with Teflon inserts  
Duty Cycle: Continuous duty 24 hours per day  
This section describes the basic specifications of the SLP-88 at the time of printing. Specifications are  
subject to change or improvement without notice or obligation.  
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Cary Audio Design SLP-88 Preamplifier Operations Manual  
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FRONT PANEL FEATURES  
Power Switch: Rotary 2 position: off/on controls the AC line voltage  
Mute: Terminates the output, also operated via remote hand set  
Input Select: 4 position rotary switch controls relay input switching  
Tape Monitor: 2-position rotary switch engages tape loop circuit  
Headphone: 2-position rotary switch will engage headphone transformers  
Listening Level: Motorized volume control, manual or via remote  
On LED: Indicates internal power supply is power up  
Operate LED: Indication of time delay release (approximately 1 minute)  
Mute LED: Lights up when the preamplifier is in mute mode  
Tape LED: indication of tape monitor loop in operation  
Down LED: Lights up red as remote volume is turned to a lower setting.  
Up LED: Lights up blue as the remote volume is turned to a higher setting.  
REAR APRON FEATURES  
AC Connector: Inlet for the detachable AC power cord, standard IEC plug  
AC Fuse: !!VERY IMPORTANT!! ONLY USE 1 AMP Slow Blow FUSE  
Remote: Female 2 circuit jack, 12 VDC @400 ma. Functions with power on.  
Dual Preamp Output: Connect to the inputs of power amps and/or a powered sub  
woofer  
Tape Out: Constant output of selected input signal for recording, independent of  
volume control setting.  
Tape In: This is the tape monitor selected input. For use with recording devices that  
employ a monitor system to hear the actual recorded signal. May also be used as an  
additional line input or an input for an equalizer or other signal adapting device.  
CD, Aux 1, Aux 2 and Tuner: These are inputs requiring line level inputs from source  
components. These inputs have wide power bandwidth, flat frequency response.  
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Cary Audio Design SLP-88 Preamplifier Operations Manual  
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INSTALLATION AND UNPACKING  
WARNING  
MAKE NO ATTEMPT TO PUT THE SLP-88 PREAMPLIFIER IN SERVICE  
WITH THE COVER OFF THE UNIT. CONTACT WITH AC VOLTAGE  
INSIDE THE SLP-88 CAN BE FATAL!  
All our shipping cartons have been especially designed to protect their contents and  
special care has been taken to prevent damage under normal conditions. Mishandling  
should be evident upon inspection of the shipping container. If damage is found after  
visual inspection, do not destroy the evidence. If necessary, document the damage with  
photographs and contact the transport carrier immediately.  
Carefully remove your new SLP-88 from its packing carton and examine it closely for  
signs of shipping damage. It is recommended to save all original packing cartons to  
protect your preamplifier should you wish to store it or ship it for after-sales service.  
WARRANTY CARD  
If you are the original USA purchaser of this preamplifier and purchased it for use within  
the United States, you should fill out the enclosed warranty registration card and return  
it to Cary Audio Design, within 10 days of your purchase. Warranty restrictions and  
applications may apply. Consult the warranty section of this manual. Export models are  
covered by local warranties assigned by your local Cary Audio distributor.  
SLP-88 PLACEMENT  
The SLP-88 is designed for use inside of homes. It must be protected from the elements  
and temperature extremes. For example, avoid placing the unit in extremely hot  
locations such as near or on top of radiators or other home heating devices. Its location  
among the user’s home audio components is not critical.  
POWER REQUIREMENTS  
The SLP-88 is designed to operate from AC house current mains. The design voltage is  
120 Volts AC at 50/60 Hz. Export units have settings for 100/200/220/240 Volts AC at  
50/60 Hz.  
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Cary Audio Design SLP-88 Preamplifier Operations Manual  
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INTERCONNECT CABLES  
The interconnect cables from the output jacks of the SLP-88 to the input jacks on the  
power amplifier can be any convenient length your set up requires. The choice of a high  
quality interconnect cable is important. Most audio dealers will have proper  
interconnect cables in stock for this purpose. The low output impedance of the SLP-88  
will run long interconnect wire runs without a problem.  
OPERATION  
Your new SLP-88 preamplifier is ready for operation after the various interconnect  
cables have been installed and the unit is plugged into the household AC mains 120 Volt  
AC wall socket. The SLP-88 is provided with functional, useful front panel controls with  
a logical layout.  
POWER SWITCH  
The power switch is located at the lower left corner on the SLP-88 preamplifier front  
panel. The switch operates in the following manner:  
OFF Removes all AC voltages from the SLP-88 power supply.  
ON  
Turns on the AC voltage to the power transformer primary  
on. The power transformer has a 200% duty cycle. In simple terms,  
the transformer is capable of operating two (2) SLP-88 preamplifiers  
continuously 24 hour a day. We recommend that the AC power  
switch be left in the ON position at all times. The SLP-88 sounds  
much better after being warmed up for at least 24 hours.  
Operate LED This blue LED will light after the SLP-88 is warmed up and  
biased properly.  
VOLUME CONTROL  
The gain of both left and right channels is controlled simultaneously by this control. The  
control potentiometer is of such high quality that the tracking error is less than 0.5 dB  
from 0 to -60 dB. The program source remains in balance over the entire range of this  
control. The taper rate of the volume control has been chosen to provide a rapid  
increase in gain over the first half of rotation and slower gain increase above 12:00  
position. The volume pot is controlling the input signal to the first grids of the 6SN7  
tubes. The volume control has a DC motor attached for remote operation.  
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Cary Audio Design SLP-88 Preamplifier Operations Manual  
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SELECTOR SWITCH  
The 4-position rotary switch connects a choice of input program source, both channels  
simultaneously. All program line sources are selected from this front panel 4 position  
switch. As you switch from source to source inputs, you will hear a soft mechanical  
clicking sound. This is normal and proper. The clicking sound is the double pole, double  
throw (DPDT) relays switching positions.  
WARNING!!!  
MAKE NO ATTEMPT TO PUT THE SLP-88 INTO SERVICE WITH THE  
TOP OFF OR THE CABINET OPEN. NEVER OPERATE THE SLP-88  
WITH THE TOP COVER REMOVED. CONTACT WITH OPERATING  
VOLTAGES PRESENT INSIDE THE SLP-88 CAN BE FATAL!  
HEADPHONE SWITCH AND JACK  
Switching to the on position will engage two output transformers for the headphones.  
The primary of each transformer is connected via gold plated relays to the output  
section of the SLP-88. Please be aware, engaging this switch still allows signal to flow to  
the Rocket 88 or your basic power amp in your system. Turn off your amplifier to listen  
to headphones. With this design there are no interruptions in the output signal path.  
You will note that a blue LED will light above the headphone switch when it is turned to  
the on position. Make sure that you turn off the headphone switch before listening with  
your amplifier. It won’t harm anything but the low frequencies may be rolled off a bit to  
the amplifier if the headphone switch is left in the on position.  
SPECIAL NOTE: Polarity Inverting Design  
Your new SLP-88 is a polarity inverting gain stage preamplifier design. This means that a  
positive direction signal coming into the SLP-88 will be polarity inverted as it is amplified  
and sent to the power amplifier as a negative direction signal. The SLP-88 has one gain  
stage and one buffer stage in each channel. This polarity inversion is common on many  
high-end preamplifiers. If you are concerned about ‘Absolute Phase’ in your system,  
reverse the positive and negative leads either on the back of both loudspeakers or at  
the output terminals of the power amplifier. Remember to do this for both channels.  
Please remember, only switch the speaker cable polarity at the power amplifier or at  
the loudspeaker, not at both. Once again, operating in the polarity inverted phase mode  
will not harm or hurt anything.  
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Cary Audio Design SLP-88 Preamplifier Operations Manual  
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FACTORY SERVICE  
If it becomes necessary to replace any parts in the SLP-88, the same brand and part  
number and style should be used. New parts are available from Cary Audio Design, Inc.  
in Cary, North Carolina.  
Careful consideration has been given to the design of your new SLP-88 preamplifier to  
keep maintenance problems to a minimum; however, it is possible that some problems  
may arise. If this occurs, we suggest contacting our Customer Service Department at  
phone number 919-355-0010 from 1 to 5 PM East Coast time to describe your problem  
in detail. Do not return the SLP-88 to the factory without a Return Authorization  
Number (RMA number) from the Customer Service Department. As the packing and  
shipping is being done by others, Cary Audio Design will assume no responsibility if the  
transportation company refuses to pay a damage claim due to your improperly packing  
or for lack of insurance should the unit be lost or damaged in shipment from you to us.  
NOTES  
Cary Audio Design  
1020 Goodworth Drive  
Apex, North Carolina 27539  
Tel: 919-355-0010  
Fax: 919-355-0013  
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