Cary Audio Design SLP-308 User's Manual
Contents
1. 4 cm x 35 5 cm Weight 15 Ib 6 8 kg Circuit Class A Triode Frequency Response 9 Hz 140 kHz 0 3 dB THD rated output 0 02 750 mV rated output 12 volts maximum Input Impedance 100 000 ohms resistive 100 K Q Output Impedance 440 ohms 440 Q Gain 12 dB Signal Noise Level 88 dB Resistors metal film Capacitors Film and foil output caps 5 micro farad 5 uFd Power Transformer 200 continuous commercial duty cycle Tubes 2 2AU7 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 Internal Wiring EE Teflon dielectric Silver wire Warm up Time 5 minutes minute auto mute Input and Output Jacks Gold plated with Teflon dielectric inserts Duty Cycle Continuous duty 24 hours per day This section describes the basic specifications of the SLP 308 at the time of printing Specifications are subject to change or improvement without notice or obligation FRONT PANEL FEATURES Power Switch 2 position toggle switch off on controls the AC line voltage Mute Terminates quiets the output also operated via remote hand set Input Select 4 position rotary switch controls relay input switching Tape Monitor 2 position toggle switch engages tape loop circuit Listening Level Motorized volume control manual or via remote with additio2. SLP 308 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 INTERCONNECT CABLES The interconnect cables from the output jacks of the SLP 308 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 Your Authorized Cary Audio Design Dealer will have proper interconnect cables in stock for this purpose The low output impedance of the SLP 308 will run long interconnect wire runs as long as 30 40 ft without a problem We suggest wires with good shielding if you live near transmitter towers for TV or radio stations OPERATION Your new SLP 308 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 308 is provided with functional useful front panel controls with an attractive and logical layout POWER SWITCH The toggle power switch is located at the left side on the SLP 308 preamplifier front panel The switch operates in the following manner OFF Down position Removes all AC voltages from the SLP 308 power supply ON Up position 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 3
3. 08 preamplifiers continuously 24 hours a day We recommend that the AC power switch be left in the ON position at all times The SLP 308 sounds much better after 100 hour burn in and when warmed up for _ hour Operate LED This blue LED will light after the SLP 308 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 2AU7 tubes The volume control has a DC motor attached for remote operation The blue LED in the volume knob is confirmation at a glance as to the overall level when you are too far away to read the output level meters 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 from the double pole double throw DPDT gold plated relays switching input po
4. Cal mano esige SLP 308 Vacuum Tube Stereo Preamplifier Operation and Installation Manual Please read this manual carefully before installing your new SLP 308 into your stereo system It contains important set up and installation information as well as safety warnings regarding AC voltage inside the chassis Dear Audiophile Friend would like to thank you personally for buying a Cary Audio SLP 308 preamplifier have spent many hours designing and voicing the SLP 308 You will find many desirable features on your new preamplifier including a motorized remote volume control dual RCA connector outputs dual output level meters a 200 duty cycle power transformer fully regulated high voltage power supply and fully regulated filament voltage for the tubes The high performance motorized volume potentiometer we use to control the analog input signal level is driven mechanically by a DC motor All incoming signals are switched via gold plated relays The best feature of the SLP 308 is the sonic presentation The 2AU7 triode tubes used in the SLP 308 are considered by many to be some of the very finest sounding dual triode tubes Please read the instruction manual so you are familiar with the operation of your new SLP 308 Thank you once again for your interest in and continued support of Cary Audio Design Dennis J Had President SPECIFICATIONS SLP 308 Stereo Tube Preamplifier Dimensions 17 1 8 Wx 4_ Hx 14 D 44 cm x 11
5. er as a negative direction signal The SLP 308 has one gain stage and one buffer stage in each channel Absolute 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 BOTH the speaker output terminals of your power amplifier Remember to do this for both channels However please remember to switch the phasing only at the amplifier or only at the loudspeaker not at both places Operating in the polarity inverted phase mode will not harm anything Cary Audio Design 1020 Goodworth Drive Apex North Carolina 27539 Tel 919 355 0010 Fax 919 355 0013 info caryaudio com www caryaudio com
6. g 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 308 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 15 days of your purchase Warranty restrictions and applications may apply Consult the warranty section of this manual Export models operated outside the USA are covered by local warranties assigned by your local Cary Audio distributor SLP 308 PLACEMENT The SLP 308 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
7. nal blue indicator LED in the volume knob Dual Output Level Meters These show output level voltage to the power amplifier 0 dB is equivalent to 0 775 volts output On LED Indicates internal power supply is power up Operate LED Indication of time delay release approximately minute 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 AMP Slow Blow FUSE Remote Trigger Female 2 circuit jack 12 VDC 400 ma On when power is on Dual Preamp Outputs Connect to inputs of power amp or powered subwoofer 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 Auxl Aux2 and Tuner These are inputs requiring line level inputs from source components These inputs have wide bandwidth flat frequency response INSTALLATION AND UNPACKING WARNING MAKE NO ATTEMPT TO PUT THE SLP 308 PREAMPLIFIER IN SERVICE WITH THE COVER OFF THE UNIT CONTACT WITH THE AC VOLTAGE INSIDE THE SLP 308 CAN BE FATAL All our shippin
8. sitions WARNING MAKE NO ATTEMPT TO PUT THE SLP 308 INTO SERVICE WITH THE TOP OFF OR THE CABINET OPEN NEVER OPERATE THE SLP 308 WITH THE TOP COVER REMOVED CONTACT WITH THE OPERATING VOLTAGES PRESENT INSIDE THE SLP 308 CAN BE FATAL FACTORY SERVICE If it becomes necessary to replace any parts in the SLP 308 the same brand and part number and style should be used New parts are available from Cary Audio Design Inc 1020 Goodworth Drive Apex North Carolina 27539 Careful consideration has been given to the design of your new SLP 308 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 to 5 PM East Coast time to describe your problem in detail Do not return the SLP 308 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 SPECIAL NOTE Your new SLP 308 preamplifier is a polarity inverting design This means that a positive direction musical signal coming into the SLP 308 will be polarity inverted as it is amplified and be sent to the power amplifi
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