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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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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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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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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