IMPORTANT SAFETY INSTRUCTIONSTHESE INSTRUCTIONS ARE TOPROTECT YOU AND THE MCINTOSHINSTRUMENT. BE SURE TOFAMILIARIZE YOURSELF WITH THEM.

1. Read all instructions - Read the safety andoperating instructions before operating theinstrument.

2. Retain Instructions - Retain the safety andoperating instructions for future reference.

3. Heed warnings - Adhere to warnings andoperating instructions.

4. Follow Instructions - Follow all operating and useinstructions.

WARNING: TO REDUCE RISK OF FIRE ORELECTRICAL SHOCK, DO NOT EXPOSE THISINSTRUMENT TO RAIN OR MOISTURE.

5. Power Sources - Connect the power supply only tothe type described in the operating instructions oras marked on the unit.

6. Power-Cord Protection - Route power-supply cordsso that they are not likely to be walked on orpinched by items placed upon or against them,paying particular attention to cords at plugs,convenience receptacles, and the point where theyexit from the instrument.

7. Ventilation - Locate the instrument for properventilation. For example, the instrument shouldnot be placed on a bed, sofa, rug, or similarsurface that may block ventilation openings; or,placed in a built-in installation, such as a bookcaseor cabinet, that may impede the flow of airthrough the ventilation openings.

8. Heat - Locate the instrument away from heatsources such as radiators, heat registers, stoves, orother appliance (including amplifiers) that produceheat.

9. Wall or Cabinet Mounting - Mount the instrumentin a wall or cabinet only as described in theowners manual.

10. Water and Moisture - Do not use the instrumentnear water - for example, near a bathtub,washbowl, kitchen sink, laundry tub, in a wetbasement, or near a swimming pool, etc.

11. Cleaning - Clean the instrument by dusting with adry cloth. Clean the panel with a cloth moistenedwith a window cleaner.

12. Object and Liquid Entry - Do not permit objects tofall and liquids to spill into the instrument throughenclosure openings.

TO EXTERNAL ANTENNATERMINALS OF PRODUCT

POWER SERVICEGROUNDING ELECTRODE SYSTEM(reg. internal metal water pipe) OPTIONAL ANTENNA

GROUNDING ELECTRODEDRIVEN 8 FEET(2.44m)INTO THE EARTH IFREQUIRED BYLOCAL CODES SEENEC SECTION 810-11

13. Power Lines - Locate any outdoor antenna awayfrom power lines.

14. Outdoor Antenna Grounding - If an outdoorantenna is connected to the antenna terminal, besure the antenna system is grounded to providesome protection against voltage surges and builtup static charge.In the U.S.A., section 810 of the National ElectricalCode, ANSl/NFPA No. 70-1987, providesinformation on the proper ground for the mastand supporting structure, ground for the lead-inwire to an antenna discharge unit, and size ofground conductors, location of antenna-dischargeunit, connection to grounding electrodes, andrequirements for the grounding electrode.For ground wire:a) Use No. 10 AWG (5.3 mm2) copper No. 8 AWG(8.4 mm2) aluminum, No. 17 AWG (1.0 mm2)copper-clad steel, bronze wire, or larger as groundwire.b) Secure antenna lead-in and ground wires tohouse with stand-off insulators spaced from 4 feet(1.22 meters) to 6 feet (1.83 meters) apart.c) Mount antenna discharge unit as closely aspossible to where lead-in enters house.d) Use jumper wire not smaller than No. 6 AWG(13.3 mm2) copper or equivalent when separateantenna grounding electrode is used.

STAND-OFFINSULATORS

ANTENNALEAD IN WIRE

BONDINGJUMPER

SERVICE ENTRANCEEQUIPMENT

15. Nonuse Periods - Unplug the power cord from theAC power outlet when left unused for a longperiod of time.

16. Damage Requiring Service - Service must beperformed by qualified service personnel when:A. The power supply cord or the plug has beendamaged; orB. Objects have fallen, or liquid has been spilledinto the instrument; orC. The instrument has been exposed to rain; orD. The instrument does not appear to operatenormally or exhibits a marked change inperformance; orE. The instrument has been dropped, or theenclosure damaged.

17. Servicing - Do not attempt to service beyond thatdescribed in the operating instructions. All otherservice should be referred to qualified servicepersonnel.

18. Grounding or Polarization - Do not defeat theinherent design features of the polarized plug.Non-polarized line cord adaptors will defeat thesafety provided by the polarized AC plug.

19. CAUTION: TO PREVENT ELECTICAL SHOCK DONOT USE THIS (POLARIZED) PLUG WITH ANEXTENSION CORD, RECEPTACLE OR OTHEROUTLET UNLESS THE BLADES CAN BE FULLYINSERTED TO PREVENT BLADE EXPOSURE.

Note to CATV system installer:This reminder is provided to call the CATV systeminstaller's attention to Article 820-22 of the NECthat provides guidelines for proper groundingand, in particular, specifies that the cable groundshall be connected to the grounding system ofthe building, as close to the point of cable entryas practical.

ATTENTION: POUR PREVENIR LES CHOCSELECTRIQUES PAS UTILISER CETTE FICHEPOLARISEE AVEC UN PROLONGATEUR, UNE PRISEDE COURANT OU UNE AUTRE SORTIE DECOURANT, SAUF SI LES LAMES PEUVENT ETREINSEREES A FOND SANS EN LAISSER AUCUNEPARTIE A DECOUVERT.

The lightning flash with arrowhead, within anequilateral triangle, is intended to alert the user tothe presence of uninsulated "dangerous voltage"within the product's enclosure that may be ofsufficient magnitude to constitute a risk of electricshock to persons.

CAUTION: TO PREVENT THE RISK OF ELECTRICSHOCK, DO NOT REMOVE COVER (OR BACK). NOUSER-SERVICABLE PARTS INSIDE. REFER SERVICINGTO QUALIFIED PERSONNEL.

The exclamation point within an equilateral triangleis intended to alert the user to the presence ofimportant operating and maintenance (servicing)instructions in the literature accompanying theappliance.

The serial number, purchase date, and MclntoshLaboratory Service Contract number are important toyou for possible insurance claim or future service.Record this information here.

Serial Number

Purchase Date

Service Contract Number

Upon application, Mclntosh Laboratoryprovides a Service Contract to the originalpurchaser. Your Mclntosh AuthorizedService Agency can expedite repairs whenyou provide the Service Contract with theinstrument for repair.

Copyright 1987 © by Mclntosh Laboratory Inc.

1

ContentsINTRODUCTION

SIMPLIFIED BLOCKDIAGRAM

INSTALLATIONHOW TO CONNECT

FRONT PANEL CONTROLSUSING THE

PUSHBUTTONSPERFORMANCE LIMITS

PERFORMANCE CHARTSTECHNICAL DESCRIPTION

BLOCK DIAGRAM

4

56, 78, 9, 1011, 12, 13

141516, 1718, 1920, 21

Your C 34V Audio/Video Control Centerwill give you many years of satisfactoryperformance. If you have any questions,please contact:

CUSTOMER SERVICEMclntosh Laboratory Inc.2 Chambers StreetBinghamton, New York 13903-9990Phone: 607-723-3512

Take Advantage of 3 yearsof Contract Service...Fill in the Application NOW.

MCINTOSH THREE YEAR SERVICE CONTRACTAn application for A THREE YEAR SERVICE CONTRACT is included with this manual.

The terms of the contract are:1. If the instrument covered by this contract

becomes defective, Mclntosh will provide all parts,materials, and labor needed to return themeasured performance of the instrument to theoriginal performance limits free of any charge. Theservice contract does not cover any shipping coststo and from the authorized service agency or thefactory.

2. Any McIntosh authorized service agency willrepair all Mclntosh instruments at normal servicerates. To receive the free service under the termsof the service contract, the service contract cer-tificate must accompany the instrument whentaken to the service agency.

3. Always have service done by a Mclntoshauthorized service agency. If the instrument is

modified or damaged as a result of unauthorizedrepair the service contract will be cancelled.Damage by improper use or mishandling is notcovered by the service contract.

4. The service contract is issued to you as theoriginal purchaser. To protect you frommisrepresentation this contract cannot betransferred to a second owner.

5. Units in operation outside the United States andCanada are not covered by the Mclntosh FactoryService Contract, irrespective of the place ofpurchase. Nor are units acquired outside the USAand Canada, the purchasers of which shouldconsult with their dealer to ascertain what, if any,service contract or warranty may be availablelocally.

2

This manual will help you to install, operate, andunderstand your Audio/Video Control Center. Read itand become familiar with it to enjoy it to the fullest.

Mclntosh has earned world renown for its technolo-gical contributions for improved sound. When youbought Mclntosh, you bought not only high technology,you bought technological integrity proven by time. TheMclntosh Audio/Video Control Center is the newestevidence of Mclntosh technological integrity.

Music reproducing instruments that carry theMclntosh name have always been designed for tech-nological leadership and to maintain the Mclntosh repu-tation for best sound, for durability, and for long life.Mclntosh has always earned the foremost reputation forquality performance. Mclntosh has provided user orient-ed facilities and appearance and Mclntosh designalways provides for ease of maintenance or repair.These fundamental elements are incorporated in theMclntosh Audio/Video Control Center, the easiest tooperate yet most complex ever.

Your Mclntosh C 34V Audio/Video Control Center,above all others will deliver to you the best sound, themost flexibility, and the greatest ease of use.

The Mclntosh C 34V is a superb quality, high perform-ance Audio control center. With the MVS-1 Video Selec-tor, the C 34V will provide both audio and video control.

The C 34V has many useful features to enhance yourlistening and video enjoyment. They include:

1. A dual preamplifier system that provides separatelisten and record program control. You may listen to orview one program while you are recording a differentprogram. With the Mclntosh MVS-1 Video Selector, theC 34V will switch video and audio signals for viewing,listening, and recording.

2. Two independent, seven source input selectorswitches permit different audio (or video with theMVS-1) programs to be selected.

3. A low noise, electronic input switching system adja-cent to the input jacks gives greater source to sourceisolation, low audio distortion, and freedom from noiseand hum pick-up. The input selector electronic swit-ching signals control the video switching in the MVS-1.

4. The record monitor switch allows the recorded pro-gram to be heard through the MAIN output, and, withthe MVS-1, the recorded video signals to be seen on aTV or monitor.

5. A five band program equalizer adjusts and im-proves the loudness contrast of the five most importantfrequency ranges. Musical balance can be adjusted tocompensate for listener preferences.

6. A precision output volume control is electronicallytrimmed during manufacture to maintain channel bal-ance accuracy to a fraction of a decibel (dB). This highorder of accuracy assures continuing program balanceas the volume is changed.

7. An active circuit loudness control, is electrically in-dependent of the volume control. Close conformity tothe Fletcher-Munson equal loudness curves can be at-tained, regardless of the volume control position.

8. High and low frequency filters reduce high fre-quency noise and low frequency rumble at a 12 dB peroctave roll off rate.

9. A compandor expands or compresses the dynamicrange of the program material. Compressed recordingsand broadcasts can be expanded to restore dynamicrange. Tapes can be compressed and replayed using ex-pansion to improve signal-to-noise ratio.

10. Front panel tape recorder jacks which allow sim-ple plug-in of an additional tape recorder withoutdisconnecting your regular system.

4 INTRODUCTION

SIMPLIFIED BLOCK DIAGRAM 5

PLAYER LOCATIONThe C34V may be installed in a Mclntosh cabinet

or custom installed in furniture of your choice.Always provide adequate ventilation. The trouble-freelife of an electronic instrument is greatly extendedby providing sufficient ventilation to prevent thebuildup of high internal temperatures that causedeterioration. Allow enough clearance so that coolair can enter at the bottom of the cabinet and bevented from the top. The recommended minimumspace for installation is 15 5/8 inches(39.7 cm) deep, 17 inches (43.2 cm) wide, and 8inches (20.32 cm) high. Never place it above heatgenerating components.

CUSTOM INSTALLATIONThe PANLOC system of installing equipment

conveniently and securely, is a product of Mclntoshresearch. The PANLOC buttons on the front panelwill lock the unit firmly in place when turned ap-proximately one-quarter turn clockwise. Aone-quarter counterclockwise turn of the PANLOCbuttons unlocks the chassis from its mounting.

To install the instrument in a Mclntosh cabinet,follow the instructions that are enclosed with thecabinet. For any other type of installation followthese instructions:

1. Unpack from CartonOpen the carton and remove the PANLOC brackets,hardware package, and mounting template. Removethe instrument from its plastic bag and place itupside down on the shipping pallet. Unscrew thefour plastic feet from the bottom of the chassis.

2. Mark the Cabinet PanelTape the mounting template in position on thecabinet panel where the instrument is to be

installed. The broken lines that represent the outlineof the rectangular cutout also represent the outsidedimensions of the chassis. Make sure these linesclear shelves, partitions, or any equipment. With thetemplate in place, first mark the six A and B holesand the four small holes that locate the corners ofthe cutout. Then, join the four corner markings withpencil lines, using the edge of the template as astraightedge.

3. Drill HolesUse a drill with a 3/16 inch (5 mm) bit heldperpendicular to the panel and drill the six A and Bholes. Then, using a drill bit slightly larger than thetip of your saw blade, drill one hole at each of twodiagonally opposite corners. The holes should barelytouch the inside edge of the penciled outline. Beforetaking the next step, make sure that the six A and Bholes have been drilled.

4. Saw the Panel CutoutSaw carefully on the inside of the penciled lines.First make the two long cuts and then the two shortcuts. After the rectangular opening has been cut out,use a file to square the corners and smooth anyirregularities in the cut edges.

6 INSTALLATION

5. Install the Mounting StripsIn the hardware package you will find two mountingstrips, and two sets of machine screws. For panelsthat are less than 1/2 inch (12.7 mm) thick, use the3/4 inch (19.1 mm) screws; for panels that are morethan 1/2 inch (12.7 rnrn) thick, use the 1-1/4 inch (31.8mm) screws.

Starting at the right-hand side of the panel, insert ascrew of the proper length into the center hole inthe panel, marked B on the template. On the back ofthe panel, align a mounting strip with the holes inthe panel and tighten the screw until the screwheadis pulled into the wood.

Repeat this procedure to attach the mounting stripto the left side of the panel.

6. Attach the PANLOC BracketsUsing two screws of the proper length in the A holeson each side, attach the PANLOC brackets to thecabinet panel; the short flange is mounted againstthe front (face) of the cabinet panel. The screws passthrough the PANLOC bracket flange, the cabinetpanel, and then through the mounting stripspreviously mounted.

the cabinet. Turn the PANLOC buttonscounterclockwise to unlock the instrument. It canthen slide outward to permit the removal of theinstrument from the cabinet.

7. Install the InstrumentGuide the AC power cord through the panel openingto the back of the cabinet; then, slide the instrumentinto the opening carefully so that the rails on the bot-tom of each side of the chassis engage the tracks onthe mounting brackets. Continue to slide theinstrument into the cabinet until the front panel isflush with the cabinet panel. Turn the PANLOCbuttons at the lower left and right corners of theinstrument panel clockwise to lock the unit firmly in

INSTALLATION 7

Fold out the photographs on the inside of the backcover. It will assist you in locating the controls andpushbuttons. The numbers and letters on the photo-graphs refer to the paragraphs that follow.

There are four fields of audio connectors on the backpanel of the C 34V for use with associated equipment:AUDIO INPUTS, EXTERNAL PROCESSORS, AUDIOOUTPUTS, and MONITOR AMPLIFIER. On the frontpanel are four additional phone jacks; two for use withan additional audio tape recorder and two for use withheadphones.

Use shielded cables to interconnect the source equip-ment and the preamplifier, To minimize the possibilityof hum or noise, the shielded cables should be ofparallel construction or if not loosely twist the left andright cables together. Locate them away from thespeaker connecting cables and AC power cords. Be cer-tain to use good quality shielded cables for all intercon-nections. Your dealer can advise you on the kind andlength of cable that will best suit your installation.

AUDIO INPUTS1. TURNTABLE:

Connect the cable from the turntable left channelto the Left PHONO INPUT. Connect the cable fromthe turntable right channel to the Right PHONO IN-PUT. If the turntable has a separate ground lead,connect it to the screw terminal marked ground (GND).

2. TUNER:Connect the cable from the tuner left channel

output to the Left TUNER INPUT. Connect thecable from the tuner right channel output to theRight TUNER INPUT.

3. CD:Connect the cable from the Compact Disc (CD)

player left channel output to the Left CD INPUT.Connect the cable from the CD player right channeloutput to the Right CD INPUT.

4. TV:Audio from a stereo TV set or TV monitor can be

connected to the TV INPUT. Connect the left chan-nel cable to the Left TV INPUT. Connect the rightchannel cable to Right TV INPUT.

The output of a monophonic TV set can be con-nected to both left and right channel TV INPUTS byuse of a "Y" connector.

5. VCR 1/TAPE 1:To Playback/Monitor: connect the cable from the

tape recorder left channel output to the LeftVCR 1/TAPE 1 INPUT. Connect the cable from the

tape recorder right channel output to the RightVCR 1/TAPE 1 INPUT. Connect a second and thirdrecorder in the same manner to the VCR 2/TAPE 2INPUT and LASER/TAPE 3 INPUT.To Record: connect the cable from the LeftVCR 1/TAPE 1 OUTPUT to the left high-level inputof the tape recorder. Connect the cable from theRight VCR 1/TAPE 1 OUTPUT to the right input ofthe tape recorder. Connect a second and thirdrecorder in the same manner to the VCR 2/TAPE 2OUTPUT and TAPE 3 OUTPUT.

M. FRONT PANEL TAPE RECORDER JACKS:TAPE 3 recorder input and output connections are

also available at the TAPE 3 IN-OUT phone jacks onthe front panel. The front panel phone jacks aredesigned for use with ¼-inch stereo phone plugs.Connections are tip: left signal, ring: right signal,and sleeve: common ground.

When a phone plug is inserted in the front panelTAPE 3 in phone jack, the circuit to the rear panelLASER/TAPE 3 INPUT is disconnected, but insertinga phone plug in the front panel TAPE 3 OUT phonejack does not disconnect the rear panel TAPE 3OUTPUT. Thus, it is possible to record from thefront panel TAPE 3 OUT phone jack and the rearpanel TAPE 3 OUTPUT at the same time but it isnot possible to listen to both at the same time.

6. VCR I/TAPE 1 - VCR 2/TAPE 2:Video Tape Recorders: If you prefer, one or both

of the VCR/TAPE inputs can be used for the audiofrom a VCR. Connect the left channel audio outputfrom the VCR to the Left VCR 1/TAPE 1 INPUT.Connect the right channel audio output from theVCR to the Right VCR 1/TAPE 1 INPUT. If the VCRhas only a single audio output (mono), use a "Y"connector to connect the program to both the leftand right input.

7. LASERVISION PLAYER:The audio from a laser vision video disc player

can be connected to the LASER/TAPE 3 INPUT ifdesired. Connect the cable from the left channelaudio output of a laser disc player to the LeftLASER/TAPE 3 INPUT. Connect the cable from theright channel audio output of a laser disc player tothe Right LASER/TAPE 3 INPUT.

8. EXTERNAL PROCESSORS:The second field of connectors are marked EXTER-

NAL PROCESSORS. There are two sets of EXTERNALPROCESSOR jacks, one set that affects the programselected by the LISTEN selector and one set that af-

8 HOW TO CONNECT

fects the program selected by the RECORD selector.These jacks are used to add a noise reduction orany audio signal processing device. Be sure tomatch the left to left and right to right channelswhen connecting external processors.

The EXTERNAL PROCESSOR jacks have switchingcontacts which allow the signal to pass throughthem when there is nothing plugged into the jacks,When an external processor is used, the program isrouted to the external processor from the EXTER-NAL PROCESSOR TO jack and back by the EXTER-NAL PROCESSOR FROM jack.

WHEN AN EXTERNAL PROCESSOR IS USED, ITMUST BE TURNED ON FOR THE PROGRAM TOBE HEARD THROUGH THE SYSTEM.

9. AUDIO OUTPUT:The third field of connectors are marked AUDIO

OUTPUT. Three sets of jacks (VCR 1/TAPE 1,VCR 2/TAPE 2, and TAPE 3) connect the programselected by the RECORD input selector. The MAINset of jacks connect the program selected by theLISTEN input selector and connect to the poweramplifier. Output to the two sets of jacks (SWITCH-ED 1 and SWITCHED 2) controlled by the front panelSPEAKER/OUTPUT 1 and 2 pushbuttons can be con-nected to additional power amplifiers for remotearea listening.

The Left MAIN jack is to be connected to theamplifier left input jack. The Right MAIN jack is tobe connected to the amplifier right input jack.

Two additional stereo power amplifiers may beconnected in the same fashion to the SWITCHEDOUTPUT jacks. Audio output signal is supplied tothese jacks only when the front panel pushbuttonSPEAKER/OUTPUT 1 and/or 2 pushbuttons arepressed in. This arrangement is useful to turn theprogram on or off to its separate amplifiers andloudspeakers.

10. MONITOR AMPLIFIER:The MONITOR AMPLIFIER provides power to

headphones. It may also be used to drive speakers.The MONITOR AMPLIFIER will furnish 20 watts perchannel across 8 ohms or 12.6 volts RMS to a 600ohm line. For operation, see MONITOR AMPLIFIERpage 13.

The input to the MONITOR AMPLIFIER can beselected from either the RECORD program, theLISTEN program, or from a third source connectedto the EXTernal INPUT jacks on the rear panel. Theinput selector switch is on the top panel of the C 34V.

The EXTernal INPUT May be used for programsources not originating in the C 34V. One use couldbe to connect the output of a time delay device forback channel speakers.

The output of the MONITOR AMPLIFIER is fed tothe front panel HEADPHONE phone jacks, to thered and black posicontact push connectors and tothe jacks marked OUTPUT. Connect the leftspeaker lead to the black COMmon push connectorand the red L terminal. Connect the right speakerlead to the black COMmon push connector and thered R terminal.

The OUTPUT jacks can be connected to drive alow impedance (8 to 600 W) unbalanced line.

11. GROUND:The ground (GND) post on the rear panel is pro-

vided primarily for a turntable or record changerthat has a separate ground lead in addition to thesignal leads.

12. AC POWER:Plug the preamplifier AC power cord into a 120

volt 60 Hz wall outlet. The plug blades are polariz-ed so be certain the plug is fully inserted in theoutlet to prevent blade exposure.CAUTION: TO PREVENT ELECTRIC SHOCK, DONOT USE THE (POLARIZED) PLUG ON THIS UNITWITH AN EXTENSION CORD, RECEPTACLE, OROTHER OUTLET UNLESS THE BLADES CAN BEFULLY INSERTED TO PREVENT BLADE EXPOSURE.

Three types of AC power outlets are provided onthe back panel of the C 34V. Three are black, twoare red, and one is green.

The black outlets are switched on or off when theC 34V is turned on and off. Use these to provide ACpower to amplifiers, CD players, or other accessories.The power capacity of all the outlets, totalled, is 1440watts. The green outlet has a maximum capacity of100 watts. For power consumption above 1440 watts,it is necessary to add a Mclntosh SCR 2 (SPEAKERCONTROL RELAY). The SCR 2 has two AC poweroutlets that provide additional capacity of 1800 wattsswitched on or off by the C 34V. Use these outlets tosupply AC power to amplifiers or other componentswhenever the total load to be switched exceeds theC 34V rating of 1440 watts.

The red outlets are on at all times and are usedwith accessories that have their own power switches.For example, a VCR should be plugged into one ofthese outlets for it to be able to record TV programswhen the main audio system is turned off.

HOW TO CONNECT 9

The green AC power outlet is on at all times andis used for turntable power. Do not use this outletfor any other purpose. When the turntable powercord is plugged into the green AC outlet, the turn-table can be used as an alternate way to switch theAC power to the entire system on or off. When theturntable power is turned on, a sensor circuit in theC 34V will detect the current drain of the turntablemotor and will turn on the C 34V the same way thered POWER pushbutton does. The red powerpushbutton must be in the OFF or out position. Aslong as a turntable is connected to the green ACoutlet, the turntable current will always override thered POWER pushbutton and turn the system on.

Some turntables draw the same or very nearly thesame current whether on or off. AUTO TURN-ONcontrol is not possible with this type of turntable.Use one of the red unswitched AC outlets instead ofthe green.

13. FUSE:A 1.0 AMP fast-acting fuse protects the C 34V

turntable current sensing circuits and the green ACturntable outlet. This fuse must be replaced with thesame type and rating 1.0 AMP fast-acting fuse. Donot use SLO BLO fuses. The fuse does not protectequipment connected to the black AC outlet.

14. OPTIONAL ACCESSORIES:ADDITIONAL AC POWER AND SPEAKER

SWITCHING WITH THE SPEAKER CONTROLRELAY

The SPEAKER CONTROL RELAY, or SCR 2, isdesigned to provide both speaker control switchingand high power switched AC outlets.

The SCR 2 also has two AC power outlets thatprovide additional capacity of 2400 watts switchedby the C 34V. Use these outlets to supply AC powerto amplifiers or other components when the totalload switched exceeds the C 34V rating of 1440watts. Plug the 4-prong plug on the cable attachedto the SCR 2 into the SCR 2 socket on the rear ofthe C 34V. Plug the SCR 2 heavy, AC power linecord directly into a wall outlet. Do not plug it intothe C 34V. When the C 34V is turned on, powerfrom the C 34V will energize a relay in the SCR 2which connects the two SCR 2 AC outlets directly tothe wall outlet.

Two loudspeakers can be turned on or off with theSCR 2 by using the front panel pushbuttons SPEAK-ER/OUTPUT 1 and 2. Use the TO MAIN SPEAKERSterminal strip to connect the main listening pair of

speakers and TO REMOTE SPEAKER terminal to aremote area pair of speakers. Connect the poweramplifier output to FROM POWER AMPLIFIER ter-minal strip. Maintain left and right orientation andlike polarity. Pushbutton SPEAKER 1 will turn themain speakers on or off and SPEAKER 2 pushbuttonwill turn the remote speakers on or off.

15. VIDEO SELECTOR:The Mclntosh VIDEO SELECTOR, MVS-1, is

designed to enable the C 34V to control video pro-grams as well as audio. The MVS-1 connects to theVIDEO SELECTOR computer-type connector on therear of the C 34V. Follow the instruction packetwith the MVS-1 for connecting the video cables,

10 HOW TO CONNECT

Fold out the photographs on the inside of the backcover. It will assist you in locating the controls andpushbuttons. The letters on the photographs refer tothe paragraphs that follow.

Before attempting to operate your C 34V Audio/VideoControl Center, familiarize yourself with the controlsand what they do.

A. LISTEN AND RECORD SELECTOR SWITCHESThe LISTEN Input selector switch is located at the

upper left on the front panel. It is used to select theinput for the LISTEN program line. The selected pro-gram source is fed to the MAIN output.

The RECORD input selector switch is located atthe lower left on the front panel. It is used to selectthe input for the RECORD program line. Theselected program source is fed to the TAPE 1, TAPE2, and TAPE 3 outputs. The RECORD and LISTENswitches operate totally independently of each otherand without any interference.

B. MODE SELECTORThe MODE SELECTOR allows you to identify each

stereo channel, create monophonic programmaterial, and direct program material to one chan-nel or the other. The MODE SELECTOR operatesonly in the LISTEN program line.

It controls the program in seven ways:L TO L&R: Connects the left input to both left and

right output circuits.R TO L&R: Connects the right input to both left

and right output circuits.STEREO REV: Connects the left input to the right

output circuit and the right input to the left outputcircuit.

STEREO: Connects the left input to the left outputcircuit and the right input to the right output circuit.Use the STEREO position for normal listening.

MONO (L + R): Adds the left to the right inputand connects the composite to both left and rightoutput circuits.

L + R TO L: Connects the left plus right programto the left output circuit only.

L + R TO R: Connects the left plus right programto the right output circuit only.

C. EQUALIZER FREQUENCY CONTROLSEach of five EQUALIZER FREQUENCY controls

raises or lowers the amplitude of a band of frequen-cies centered on the frequency marked above thecontrol. Both left and right channels are affected.The center, or flat position of the control has a de-tent for easy reference. In the center or detent posi-tion, the entire circuit for that control is removed

from the program circuit by grounding the controlelectronically. The result is the "straight wire withgain" or the flexibility of complete musical balanc-ing to your taste.

Use the EQUALIZER FREQUENCY controls tomodify the sound and balance of program material.

Here are some suggestions:Adjustment to __ Equalizer CorrectionMake deep bass louderMake all bass louderReinforce voicesHum on programBrighten violinsand trumpetsEmphasize cymbals

Raise 30Raise 30 and 150Lower 150 and raise 500Reduce 30 and 150

Raise 1500Raise 10 K

The EQUALIZER FREQUENCY controls can beswitched to either the LISTEN or RECORD programlines by the RECORD EQUALIZER pushbutton.Because the equalizer is in the circuit after the COM-PANDOR, use of the equalizer will not affect the per-formance characteristics of the COMPANDOR.

D. BALANCE AND LOUDNESSThe BALANCE and LOUDNESS controls are con-

centric. The BALANCE control (large outer knob)adjusts the volume of the channels relative to eachother.

L-left...turning the control to the left accents theleft channel by reducing the right channel output.

R-right...turning the control to the right accentsthe right channel by reducing the left channeloutput.

E. LOUDNESSThe LOUDNESS control (small center knob) pro-

vides frequency response contoured to compensatefor the behavior of the human ear at lower listeninglevels. This contour is accurately modeled after thefamily of "equal loudness" curves identified by Flet-cher and Munson. At the fully counterclockwisedetented FLAT position, the loudness contour iselectrically flat. As the control is turned clockwise,both bass and treble frequencies increase in thecorrect proportion. The contour is not affected bydifferent settings of the VOLUME control. After set-ting the VOLUME control for the desired listeninglevel, adjust the LOUDNESS control for the prefer-red compensation.

F. COMPANDOR SYSTEM:The Mclntosh COMPANDOR System can be used

to control the dynamic range of program material. Itcan be used in two different ways: to function as an

FRONT PANEL CONTROLS 11

expander or as a compressor. Expansion can restorethe dynamic range limited by the process of record-ing both records and tape or broadcasting of music.Compression decreases dynamic range. It can be

used for making tape recordings or for listening tobackground music. The Compandor can beswitched to either the RECORD or LISTEN lines, bymeans of the COMPANDOR pushbutton.

The Compandor System has four controls. Theconcentric three-position COMPANDOR switch andRATIO control are located on the front panel. TheLEVEL MATCH control and SPEED selector are lo-cated on the C 34V top panel.

COMPANDOR SELECTORThe outer COMPANDOR knob can be set to EX-

PAND, OFF, or COMPRESS. When the COMPAN-DOR switch is in EXPAND or COMPRESS, a redlight will appear above the LISten-or RECord COM-PANDOR pushbutton. In the center OFF position,the Compandor System is switched out of the circuitand the lights will be out. When the Compandor isnot used, the selector should be placed in the OFFposition.

RATIO CONTROLThe inner RATIO knob is used to control the

amount of expansion or compression.

LEVEL MATCHThe LEVEL MATCH control on the top panel is

used to adjust the listening level when the expanderor compressor is switched in or out of the circuit.

SPEEDThe SPEED selector on the top panel is used to

control the rate at which the Compandor System re-sponds to signals. By switching from FAST to NOR-MAL to SLOW, a more gradual rate of change in ex-pansion or compression occurs. For music with per-cussive instruments, such as piano, drums, guitar,etc., use NORMAL or FAST. In the FAST mode, theCompandor System follows changes quickly but willtrack low frequencies less accurately. Non-percussive music and voice require slower speed.At SLOW speed the low frequency tracking is ac-curate, but the rate of response is slower. The NOR-MAL position is best suited for most programmaterial.

USING THE COMPANDOR AS AN EXPANDERWhen the COMPANDOR selector switch is in the

EXPAND position, the RATIO control is used toselect the amount of expansion. Full counterclock-wise rotation corresponds to a ratio of 1.0. This

means that the dynamic range of the expander out-put is the same as the dynamic range of its input.With the VOLUME control at a normal listeninglevel, the RATIO control is turned clockwise, theoutput dynamic range becomes greater than the in-put. Set the RATIO control to the desired expansion(usually between 1.2 and 1.5). Now switch theCOMPANDOR selector knob between EXPAND andOFF. A change in the average listening level willusually be heard. Adjust the LEVEL MATCH (on thetop panel) control until the average listening levelsmatch as closely as possible when in EXPAND andOFF. After this adjustment, you will notice that withthe expander on, loud passages will be louder andsoft passages will be softer tending to make anybackground noise quieter.

When the RATIO control is at the fully clockwiseposition, it corresponds to a ratio of 2.0. The outputdynamic range is then twice the input dynamicrange. This setting is extreme for most programmaterial.

USING THE COMPANDOR AS A COMPRESSORWhen the COMPANDOR selector switch is in the

COMPRESS position, the RATIO control is used toselect the reduction in dynamic range desired. Fullcounterclockwise rotation corresponds to a ratio of1.0. The compressor output and input dynamicrange will be the same. Set the VOLUME control toa normal listening level. As the RATIO control isturned clockwise, the output dynamic range be-comes less than the input range. Set the RATIOcontrol to the desired amount of compression.Switch the COMPANDOR selector knob betweenCOMPRESS and OFF. A change in the average lis-tening level will usually be heard. Adjust the LEVELMATCH control until the average listening levelsmatch as closely as possible when switching be-tween COMPRESS and OFF. After this adjustment,you will notice that with COMPRESS on, loudpassages will be softer and soft passages will belouder.

When the RATIO control is at the fully clockwiseposition it corresponds to a ratio of 2.0. The outputdynamic range is then one half of the input range.This setting can be useful to create highly compress-ed tape recordings particularly useful in noisy loca-tions such as automobiles, etc.

Two examples for using the expander are:1. To reduce background noise (hum, hiss orscratch):

a. Select the desired program source with the

12 FRONT PANEL CONTROLS

LISTEN input selector.b. Increase the VOLUME control during a quiet

passage of the program until noise is clearly audible.c. Turn the COMPANDOR selector knob to EX-

PAND. The Listen indicator will light over theCOMPANDOR pushbutton.

d. Rotate the RATIO control clockwise until thenoise is acceptably reduced.

e. Adjust the LEVEL MATCH control aspreviously described.

2. To improve the sound of recorded or broadcast

program material:a. Select the input on the LISTEN input selector.b. Increase the VOLUME to a satisfactory level.c. Turn the COMPANDOR selector switch to

EXPAND.d. Rotate the RATIO control clockwise until the

dynamic range of the music is satisfactory for you.The usual position will be between 1.2 and 1.5.

e. Adjust the LEVEL MATCH control aspreviously described.

TOP PANEL CONTROLS

COMPANDOROperation of the LEVEL MATCH and SPEED controls

is explained on page 12. See the Compandor Systemdescription.

MONITOR AMPLIFIERThe built-in MONITOR AMPLIFIER can drive head-

phones, loudspeakers, or provide a low impedance lineoutput. A top panel input position switch selects the in-put for the MONITOR AMPLIFIER. The sources are theLISTEN program line, the RECORD program line, or anyhigh level EXTERNAL source. When using headphonesplugged into the front panel jacks, the normal positionis LISTEN.

The monitor amplifier LEFT and RIGHT CAIN controlsare located to the left of the INPUT switch on the toppanel. When the switch is in the LISTEN position, the

LEFT and RIGHT GAIN controls regulate the monitorvolume along with the main front panel VOLUME con-trol. When the INPUT switch is in the RECORD or EX-TERNAL position, only the LEFT and RIGHT GAIN con-trols regulate the monitor amplifier volume.

The monitor amplifier can be used with any low im-pedance dynamic headphones. High impedance head-phones will work but at reduced listening levels.

FRONT PANEL CONTROLS 13

G. COMPANDORThe COMPANDOR pushbutton switches the

COMPANDOR circuits between the LISTEN (outposition) and RECORD (in position) program lines ordisconnects the circuit entirely. A red light emittingdiode (LED) illuminates to indicate when the circuitis connected to either Listen or RECord. Whenneither is lit, the COMPANDOR selector knob isturned to the OFF position.

H. RECord EQUALThe EQUALIZER FREQUENCY pushbutton con-

nects these controls to the LISTEN or RECORD pro-gram lines. When the pushbutton is out, theEQUALIZER FREQUENCY controls are connected tothe LISTEN line, and the red LED indicator abovethe button is off. When the pushbutton is in, theyare connected to the RECORD line. The red LED in-dicator will be on. The normal position is with thepushbutton out.

1. RECord MONITORTo monitor while recording with a three-head

tape recorder, set the LISTEN input selector to theproper TAPE position. The RECord MONITOR LEDindicator is off when listening to the programrecorded on the tape and on when listening to theprogram source being fed to the tape recorder.

J. LF FILTERThe Low Frequency FILTER is in the LISTEN pro-

gram line only. When the pushbutton is out, thefilter is out of the circuit and the red indicator lightwill be off. When the pushbutton is in, the LF FIL-TER is in the circuit and the red light will be on.The filter is effective for all frequencies below 50 Hzand attenuates at the rate of 12 dB per octave. Useit to reduce undesirable low frequency noise suchas rumble or mechanical feedback.

K. HF FILTERThe High Frequency FILTER is in the LISTEN pro-

gram line only. When the pushbutton is out, the HFFILTER is out of the circuit and the red indicatorlight is off. When the pushbutton is in, the HF FIL-TER is in the circuit and the red light is on. Thefilter is effective for all frequencies above 7,000 Hzand attenuates at the rate of 12 dB per octave. Useit to reduce undesirable high frequency noise suchas record surface noise or tape hiss.

L. SPEAKER/OUTPUT 1 and 2The SPEAKER/OUTPUT 1 and 2 pushbuttons can

be used to switch on or off either the AUDIO OUT-PUT SWITCHED 1 and 2 jacks or the main and

remote speakers when an optional Speaker ControlRelay (SCR 2) is used.

The SWITCHED 1 and 2 jacks on the rear panelof the C 34V have the same program as the MAINOUTPUT. When one or both SPEAKER/OUTPUTpushbuttons are IN, the LISTEN program line is con-nected to the corresponding pair of OUTPUT jacksand the LED indicator is turned on. Program toother devices can be controlled such as rear chan-nel delay, reverberation, etc. Example: connect theSWITCHED 1 jack to the input of a reverberationdevice and the output of the reverberation deviceto the input C 34V MONITOR AMPLIFIER and theoutput of the MONITOR AMPLIFIER to a set of rearloudspeakers. (The monitor amplifier switch must bein the EXTERNAL position.) Rear channel reverbera-tion can then be switched on or off by the SPEAKEROUTPUT 1 pushbutton without the need for an ad-ditional amplifier.

N. POWER ONThe red pushbutton turns the C 34V on or off.

When the power is on, the panel illuminates andthe red light above this pushbutton will go on. Theturntable can also be used as a power switch. Seepage 10.

14 PUSHBUTTONS

PERFORMANCE LIMITSPerformance limits are the maximum deviation from

perfection permitted for a Mclntosh instrument. Wepromise you that when you purchase a new C 34V froma Mclntosh franchised dealer, it will be capable of orcan be made capable of performance at or exceedingthese limits or you can return the unit and get yourmoney back. Mclntosh is the only manufacturer thatmakes this statement.

PREAMPLIFIER SECTION

FREQUENCY RESPONSE+ 0, -0.5dB from 20Hz to 20,000Hz

MAXIMUM VOLTAGE OUTPUT10 volts from 20Hz to 20,000Hz

TOTAL HARMONIC DISTORTION0.01% maximum from 20Hz to 20,000Hzat rated output

SENSITIVITYPhono- 2mV for 2.5V rated output

(0.4mV IHF)High Level- 250mV for 2.5V rated output

(50mV IHF)

SIGNAL TO NOISE RATIO, A-WEIGHTEDPhono- 90dB below 10mV input

(84dB IHF)High Level- 100dB below rated output

(86dB IHF)

MAXIMUM INPUT SIGNALPhono- 100mVHigh Level- 10 volts

INPUT IMPEDANCEPhono- 47k ohms and 65pf capacitanceHigh Level- 50k ohms

EQUALIZATION CONTROLSVariable 12dB boost to 12dB cut at center frequen-cies of 30, 150, 500, 1500, 10k Hz

COMPANDOR RATIOSFrom 1:2 compression to 2:1 expansion

LF FILTERFlat or roll-off at 12dB per octave below 50 Hz.

HF FILTERFlat or roll-off at 12dB per octave above 7,000 Hz.

MONITOR AMPLIFIER SECTION

CONTINUOUS AVERAGE POWER OUTPUT20 watts per channel into 8 ohms, from 20Hz to

20kHz, at 0.01% maximum harmonic distortion

FREQUENCY RESPONSE+ 0 -0.2dB from 20Hz to 20,000Hz

SENSITIVITY750mV for rated output (170mV IHF), input im-pedance is 27K ohms

SIGNAL TO NOISE RATIO, A-WEIGHTED100dB below rated output (87dB IHF)

GENERAL INFORMATION

SEMICONDUCTOR COMPLEMENT31 Bipolar Transistors76 Field Effect Transistors35 Integrated Circuits

107 Diodes1 Silicon Controlled Rectifier (SCR 2)

AC POWER OUTLETS1 green turntable current sensing, 100 watts2 red unswitched3 black switched1440 watts total capacity

POWER REQUIREMENTS120 volts, 50/60 Hz, 25 to 85 watts

MECHANICAL INFORMATION

S I Z E :16-1/8 inches wide (40.6 cm) by 5-7/16 inches high

(13.8 cm) by 13 inches deep (33 cm), from themounting surface, including PANLOC shelf and backpanel connectors. Knob clearance required is 1-1/4inches (3.2 cm) in front of the mounting panel.

FINISH:Front panel is anodized gold and black with special

gold/teal nomenclature illumination. Chassis is black.

MOUNTING:Exclusive Mclntosh developed professional PANLOC

WEIGHT:

26 pounds (11.8 kg) net, 38 pounds (17.2 kg) inshipping carton

PERFORMANCE LIMITS 15

16 PERFORMANCE CHARTS

PERFORMANCE CHARTS 17

The simplified block diagram on page 5 and the de-tailed block diagram on pages 20 and 21 show how theC 34V internal circuits are arranged. The C 34V usesseparate program channels (referred to as "programlines" in this manual) for "listening" and "recording".This allows you to listen to any program source whileyou record from another or the same program source.The mode selector, volume control, loudness control,balance control, and LF and HF filters are in the listenprogram line only. The compandor, the five equalizerfrequency controls, and the monitor amplifier can be in-dividually switched to the listen program line or therecord program line.

PHONO AMPLIFIERThis amplifier uses a high technology integrated circuit

operational amplifier. Its differential input stage hasbeen optimized for low noise and low distortion perfor-mance. Open loop gain of this integrated circuit is100,000 times. With high open loop gain a largeamount of negative feedback is used around the phonoamplifier to further reduce noise and distortion. Thefeedback network also provides precision RIAA frequen-cy compensation. The network uses 1% metal film resis-tors and 5% poly film capacitors. To achieve low noiseperformance it is essential that the feedback networkhave very low impedance. As a consequence, the pre-amplifier must be capable of operating as a poweramplifier to drive this impedance. The actual power out-put capability of this preamplifier stage is more than 100milliwatts, a great margin beyond that which is re-quired.

Input sensitivity of the phono amplifier is 2.2 milli-volts. The gain of the amplifier is 42 dB at 1000 Hz. Thephono amplifier has a very wide dynamic range. At1000 Hz the phono input circuit will accept 100 milli-volts without overload, a voltage far greater than theoutput of any magnetic phono cartridge presentlyavailable.

LISTEN AND RECORD SELECTOR SWITCHESInput switching is accomplished electronically. Signals

from the 7 inputs connect to two arrays of Field EffectTransistors (FET) to perform the switching. Controlsignals from the listen and record selector switches turnon the appropriate FET switches to pass the selected in-put signals. The other input signals are blocked by the"off" FET switches. Each FET switch uses two cascadedFET transistors to provide the required isolation and pre-vent cross talk between inputs. The FET "on" resistanceis very low which prevents distortion. The switchingtransistors are located right at the input jacks, so that

signal wiring is kept to a minimum which eliminatescross talk and noise problems.

LISTEN PROGRAM LINEThe listen program signal from the LISTEN input

switch goes to the COMPANDOR control switchingwhere the COMPANDOR can be inserted in either thelisten or the record program path. The COMPANDORcircuit is described later.

The listen program then goes to the LISTEN EXTER-NAL Processor jacks. When an EXTERNAL PROCESSORis used, the listen program leaves the C 34V through theEXTERNAL processor TO jack and returns via the FROMjack. If a processor is not used, the signal passes directlythrough the switching contacts In the jacks.

The volume control is next in the l isten path. It is astep attenuator with left to right tracking accuracy betterthan 1 dB throughout its entire range. Such extremelyaccurate matching is achieved through electronicallycontrolled trimming of the resistance material depositedon pairs of printed circuits within the control. Since theswitch commutator touches only contact pads and notthe actual resistance element, tracking accuracy is notdegraded with use as in ordinary volume controls.

The loudness control and its amplifiers follow the vol-ume control. In the past, loudness controls have typi-cally been simple passive circuits connected to a tap onthe volume control. As a consequence, compensationaccuracy was dependent on many variables such asvolume control position and differences in the inputlevel. The C 34V loudness control uses active circuits ofan integrated circuit operational amplifier with two feed-back loops. One has flat frequency response, while theother has response conforming to the Fletcher-Munsonequal loudness contours. A potentiometer is placed be-tween these two feedback loops making it possible toselect any combination of the two, from a flat responseto full loudness compensation. The overall gain of thestage is 20 dB at mid-frequencies and the average listen-ing volume is not affected by the position of theloudness control.

The listen program signals next pass to the balancecontrol and then to the equalizer amplifier composed ofa low noise operational amplifier with flat response andunity gain. Five other operational amplifiers are arrang-ed in circuit configurations that are equivalent to fiveseries tuned circuits, each at one of the equalizer fre-quencies. These series tuned circuits are inserted viacontrol potentiometers into either the input circuit orfeedback circuit of the equalizer amplifier to provide aboost or cut capability of 12 dB for each equalizer band

18 TECHNICAL DESCRIPTION

of frequencies. A pushbutton switch allows theequalizer circuit to be switched from the listen programline to the record program line.

The LF and HF Filters follow the equalizer amplifier.These are active filters using operational amplifiers.When switched in, the LF filter attenuates frequenciesbelow 50 Hz at a rate of 12 dB per octave. The HFFilter attenuates frequencies above 7 kHz at a rate of 12dB per octave.

The listen program signal then is fed to the main out-put jacks. The OUTPUT 1 and OUTPUT 2 jacks receivethe same signal but can be turned on or off by theSpeaker/Output 1 and 2 pushbuttons.

RECORD PROGRAM LINEThe RECORD program signal from the RECORD input

switch goes first through a unity gain amplifier and thento the COMPANDOR switching where the Compandorcan be inserted into the record program path. TheCompandor circuit is described later. The record pro-gram then goes to the RECORD EXTERNAL PROCESSORjacks. These jacks, like the LISTEN EXTERNAL PRO-CESSOR jacks, have switching contacts so that the signalpasses through when plugs are not inserted in the jacks.When an external processor is used, the record pro-gram leaves the C 34V through the EXTERNAL PRO-CESSOR TO jack and returns via the FROM jack. Whena processor is not connected, the signal passes directlythrough the jacks.

An equalizer amplifier with unity gain follows. Apushbutton switch allows the 5 band equalizer controlsto be switched from the Listen program line to theRecord program line. This feature allows equalizing therecord signal before it is fed to a recorder.

The equalizer amplifier feeds to electronic interlockswitching and then finally to the record output jacks.The switching is arranged so that if the Record inputselector is positioned to select the output of a recorder,the Record program line will not feed the record outputjack connected to that recorder. This prevents recorderfeedback.

COMPANDORThe Compandor will expand or compress the

dynamic range of the program material. The Compan-dor can be switched to the Listen or Record programlines or turned off. Program to the Compandor is ap-plied to a voltage controlled amplifier (VCA) whichoperates as a variable gain block. Control voltages forthis VCA are developed from a sample taken from theleft and right channel input signals to the VCA. Theelectronic processing of this sample is detailed. It in-

cludes band shaping, logarithmic conversion, full waverectification, level setting, expansion or compressionratio regulation, attack timing, and DC amplification.The resulting processed voltage controls the gain of theVCA to cause logarithmic gain expansion when expan-ding the program, or the opposite, logarithmic gaincompression when compressing the program.

MONITOR AMPLIFIERThe monitor amplifier is a 20 watt per channel stereo

power amplifier. The monitor input selector switchallows the amplifier to be driven from the LISTEN orRECORD program lines or from an external input. It is apush pull complementary class AB amplifier using a dif-ferential input stage. The amplifier includes the Mcln-tosh Power Guard* protection circuit. The Power Guardcircuit compares the amplifier output signal with its in-put signal. If there is a difference between thewaveforms of these signals, Power Guard activates anelectronic attenuator at the input of the amplifier whichreduces the amplifier input level. This automatic controlsystem makes it impossible to drive the monitoramplifier into clipping. Thus, clipping distortion andloudspeaker damage due to clipping are eliminated.

AUTO TURN-ONA turntable plugged into the green outlet at the rear

of the C 34V can control the on-off operation of theC 34V. Current flow to the turntable is sensed and con-trols a silicon control rectifier (SCR). When the SCR con-ducts a relay closes. This relay turns on power to theC 34V and to the black AC power outlets. Power is alsocontrolled by the C 34V Power On pushbutton.

•protected by US Patent #4048573)

TECHNICAL DESCRIPTION 19

C 34V

20 BLOCK DIAGRAM

BLOCK DIAGRAM 21

THE LOCATION OFCONTROLS AND PUSHBUTTONSThe numbers and letters correspond to the paragraphs on pages 8, 9, 10, 11 and 12.