important safety instructions
IMPORTANT SAFETY INSTRUCTIONS
THESE INSTRUCTIONS ARE TO
PROTECT YOU AND THE MCINTOSH
INSTRUMENT. BE SURE TO
FAMILIARIZE YOURSELF WITH THEM.
1. Read all instructions - Read the safety and
operating instructions before operating the
instrument.
2. Retain Instructions - Retain the safety and
operating instructions for future reference.
3. Heed warnings - Adhere to warnings and
operating instructions.
4. Follow Instructions - Follow all operating and use
instructions.
WARNING: TO REDUCE RISK OF FIRE OR
ELECTRICAL SHOCK, DO NOT EXPOSE THIS
INSTRUMENT TO RAIN OR MOISTURE.
5. Power Sources - Connect the power supply only to
the type described in the operating instructions or
as marked on the unit.
6. Power-Cord Protection - Route power-supply cords
so that they are not likely to be walked on or
pinched by items placed upon or against them,
paying particular attention to cords at plugs,
convenience receptacles, and the point where they
exit from the instrument.
7. Ventilation - Locate the instrument for proper
ventilation. For example, the instrument should
not be placed on a bed, sofa, rug, or similar
surface that may block ventilation openings; or,
placed in a built-in installation, such as a bookcase
or cabinet, that may impede the flow of air
through the ventilation openings.
8. Heat - Locate the instrument away from heat
sources such as radiators, heat registers, stoves, or
other appliance (including amplifiers) that produce
heat.
9. Wall or Cabinet Mounting - Mount the instrument
in a wall or cabinet only as described in the
owners manual.
10. Water and Moisture - Do not use the instrument
near water - for example, near a bathtub,
washbowl, kitchen sink, laundry tub, in a wet
basement, or near a swimming pool, etc.
11. Cleaning - Clean the instrument by dusting with a
dry cloth. Clean the panel with a cloth moistened
with a window cleaner.
12. Object and Liquid Entry - Do not permit objects to
fall and liquids to spill into the instrument through
enclosure openings.
STAND-OFF
INSULATORS
ANTENNA
LEAD IN WIRE
TO EXTERNAL ANTENNA
TERMINALS OF PRODUCT
SERVICE ENTRANCE
EQUIPMENT
POWER SERVICE
GROUNDING ELECTRODE SYSTEM
(reg. internal metal water pipe)
BONDING
JUMPER
OPTIONAL ANTENNA
GROUNDING ELECTRODE
DRIVEN 8 FEET(2.44m)
INTO THE EARTH IF
REQUIRED BY
LOCAL CODES SEE
NEC SECTION 810-11
13. Power Lines - Locate any outdoor antenna away
from power lines.
14. Outdoor Antenna Grounding - If an outdoor
antenna is connected to the antenna terminal, be
sure the antenna system is grounded to provide
some protection against voltage surges and built
up static charge.
In the U.S.A., section 810 of the National Electrical
Code, ANSl/NFPA No. 70-1987, provides
information on the proper ground for the mast
and supporting structure, ground for the lead-in
wire to an antenna discharge unit, and size of
ground conductors, location of antenna-discharge
unit, connection to grounding electrodes, and
requirements 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 ground
wire.
b) Secure antenna lead-in and ground wires to
house 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 as
possible to where lead-in enters house.
d) Use jumper wire not smaller than No. 6 AWG
(13.3 mm2) copper or equivalent when separate
antenna grounding electrode is used.
15. Nonuse Periods - Unplug the power cord from the
AC power outlet when left unused for a long
period of time.
16. Damage Requiring Service - Service must be
performed by qualified service personnel when:
A. The power supply cord or the plug has been
damaged; or
B. Objects have fallen, or liquid has been spilled
into the instrument; or
C. The instrument has been exposed to rain; or
D. The instrument does not appear to operate
normally or exhibits a marked change in
performance; or
E. The instrument has been dropped, or the
enclosure damaged.
17. Servicing - Do not attempt to service beyond that
described in the operating instructions. All other
service should be referred to qualified service
personnel.
18. Grounding or Polarization - Do not defeat the
inherent design features of the polarized plug.
Non-polarized line cord adaptors will defeat the
safety provided by the polarized AC plug.
The lightning flash with arrowhead, within an
equilateral triangle, is intended to alert the user to
the presence of uninsulated "dangerous voltage"
within the product's enclosure that may be of
sufficient magnitude to constitute a risk of electric
shock to persons.
19. CAUTION: TO PREVENT ELECTICAL SHOCK DO
NOT USE THIS (POLARIZED) PLUG WITH AN
EXTENSION CORD, RECEPTACLE OR OTHER
OUTLET UNLESS THE BLADES CAN BE FULLY
INSERTED TO PREVENT BLADE EXPOSURE.
Note to CATV system installer:
This reminder is provided to call the CATV system
installer's attention to Article 820-22 of the NEC
that provides guidelines for proper grounding
and, in particular, specifies that the cable ground
shall be connected to the grounding system of
the building, as close to the point of cable entry
as practical.
ATTENTION: POUR PREVENIR LES CHOCS
ELECTRIQUES PAS UTILISER CETTE FICHE
POLARISEE AVEC UN PROLONGATEUR, UNE PRISE
DE COURANT OU UNE AUTRE SORTIE DE
COURANT, SAUF SI LES LAMES PEUVENT ETRE
INSEREES A FOND SANS EN LAISSER AUCUNE
PARTIE A DECOUVERT.
The serial number, purchase date, and Mclntosh
Laboratory Service Contract number are important to
you for possible insurance claim or future service.
Record this information here.
Serial Number
Purchase Date
CAUTION: TO PREVENT THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE COVER (OR BACK). NO
USER-SERVICABLE PARTS INSIDE. REFER SERVICING
TO QUALIFIED PERSONNEL.
The exclamation point within an equilateral triangle
is intended to alert the user to the presence of
important operating and maintenance (servicing)
instructions in the literature accompanying the
appliance.
Service Contract Number
Upon application, Mclntosh Laboratory
provides a Service Contract to the original
purchaser. Your Mclntosh Authorized
Service Agency can expedite repairs when
you provide the Service Contract with the
instrument for repair.
Copyright 1987 © by Mclntosh Laboratory Inc.
1
Contents
INTRODUCTION
SIMPLIFIED BLOCK
DIAGRAM
INSTALLATION
HOW TO CONNECT
FRONT PANEL CONTROLS
USING THE
PUSHBUTTONS
PERFORMANCE LIMITS
PERFORMANCE CHARTS
TECHNICAL DESCRIPTION
BLOCK DIAGRAM
4
5
6, 7
8, 9, 10
11, 12, 13
Your C 34V Audio/Video Control Center
will give you many years of satisfactory
performance. If you have any questions,
please contact:
CUSTOMER SERVICE
Mclntosh Laboratory Inc.
2 Chambers Street
Binghamton, New York 13903-9990
Phone: 607-723-3512
14
15
16, 17
18, 19
20, 21
Take Advantage of 3 years
of Contract Service...
Fill in the Application NOW.
MCINTOSH THREE YEAR SERVICE CONTRACT
An 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 the
measured performance of the instrument to the
original performance limits free of any charge. The
service contract does not cover any shipping costs
to and from the authorized service agency or the
factory.
2. Any McIntosh authorized service agency will
repair all Mclntosh instruments at normal service
rates. To receive the free service under the terms
of the service contract, the service contract certificate must accompany the instrument when
taken to the service agency.
3. Always have service done by a Mclntosh
authorized service agency. If the instrument is
2
modified or damaged as a result of unauthorized
repair the service contract will be cancelled.
Damage by improper use or mishandling is not
covered by the service contract.
4. The service contract is issued to you as the
original purchaser. To protect you from
misrepresentation this contract cannot be
transferred to a second owner.
5. Units in operation outside the United States and
Canada are not covered by the Mclntosh Factory
Service Contract, irrespective of the place of
purchase. Nor are units acquired outside the USA
and Canada, the purchasers of which should
consult with their dealer to ascertain what, if any,
service contract or warranty may be available
locally.
This manual will help you to install, operate, and
understand your Audio/Video Control Center. Read it
and become familiar with it to enjoy it to the fullest.
Mclntosh has earned world renown for its technological contributions for improved sound. When you
bought Mclntosh, you bought not only high technology,
you bought technological integrity proven by time. The
Mclntosh Audio/Video Control Center is the newest
evidence of Mclntosh technological integrity.
Music reproducing instruments that carry the
Mclntosh name have always been designed for technological leadership and to maintain the Mclntosh reputation for best sound, for durability, and for long life.
Mclntosh has always earned the foremost reputation for
quality performance. Mclntosh has provided user oriented facilities and appearance and Mclntosh design
always provides for ease of maintenance or repair.
These fundamental elements are incorporated in the
Mclntosh Audio/Video Control Center, the easiest to
operate yet most complex ever.
Your Mclntosh C 34V Audio/Video Control Center,
above all others will deliver to you the best sound, the
most flexibility, and the greatest ease of use.
The Mclntosh C 34V is a superb quality, high performance Audio control center. With the MVS-1 Video Selector, the C 34V will provide both audio and video control.
The C 34V has many useful features to enhance your
listening and video enjoyment. They include:
1. A dual preamplifier system that provides separate
listen and record program control. You may listen to or
view one program while you are recording a different
program. With the Mclntosh MVS-1 Video Selector, the
C 34V will switch video and audio signals for viewing,
listening, and recording.
2. Two independent, seven source input selector
switches permit different audio (or video with the
MVS-1) programs to be selected.
3. A low noise, electronic input switching system adjacent to the input jacks gives greater source to source
isolation, low audio distortion, and freedom from noise
and hum pick-up. The input selector electronic switching signals control the video switching in the MVS-1.
4. The record monitor switch allows the recorded program to be heard through the MAIN output, and, with
the MVS-1, the recorded video signals to be seen on a
TV or monitor.
5. A five band program equalizer adjusts and improves the loudness contrast of the five most important
frequency ranges. Musical balance can be adjusted to
compensate for listener preferences.
6. A precision output volume control is electronically
trimmed during manufacture to maintain channel balance accuracy to a fraction of a decibel (dB). This high
order of accuracy assures continuing program balance
as the volume is changed.
7. An active circuit loudness control, is electrically independent of the volume control. Close conformity to
the Fletcher-Munson equal loudness curves can be attained, regardless of the volume control position.
8. High and low frequency filters reduce high frequency noise and low frequency rumble at a 12 dB per
octave roll off rate.
9. A compandor expands or compresses the dynamic
range of the program material. Compressed recordings
and broadcasts can be expanded to restore dynamic
range. Tapes can be compressed and replayed using expansion to improve signal-to-noise ratio.
10. Front panel tape recorder jacks which allow simple plug-in of an additional tape recorder without
disconnecting your regular system.
4 INTRODUCTION
SIMPLIFIED BLOCK DIAGRAM 5
PLAYER LOCATION
The C34V may be installed in a Mclntosh cabinet
or custom installed in furniture of your choice.
Always provide adequate ventilation. The trouble-free
life of an electronic instrument is greatly extended
by providing sufficient ventilation to prevent the
buildup of high internal temperatures that cause
deterioration. Allow enough clearance so that cool
air can enter at the bottom of the cabinet and be
vented from the top. The recommended minimum
space for installation is 15 5/8 inches
(39.7 cm) deep, 17 inches (43.2 cm) wide, and 8
inches (20.32 cm) high. Never place it above heat
generating components.
CUSTOM INSTALLATION
The PANLOC system of installing equipment
conveniently and securely, is a product of Mclntosh
research. The PANLOC buttons on the front panel
will lock the unit firmly in place when turned approximately one-quarter turn clockwise. A
one-quarter counterclockwise turn of the PANLOC
buttons unlocks the chassis from its mounting.
To install the instrument in a Mclntosh cabinet,
follow the instructions that are enclosed with the
cabinet. For any other type of installation follow
these instructions:
1. Unpack from Carton
Open the carton and remove the PANLOC brackets,
hardware package, and mounting template. Remove
the instrument from its plastic bag and place it
upside down on the shipping pallet. Unscrew the
four plastic feet from the bottom of the chassis.
2. Mark the Cabinet Panel
Tape the mounting template in position on the
cabinet panel where the instrument is to be
installed. The broken lines that represent the outline
of the rectangular cutout also represent the outside
dimensions of the chassis. Make sure these lines
clear shelves, partitions, or any equipment. With the
template in place, first mark the six A and B holes
and the four small holes that locate the corners of
the cutout. Then, join the four corner markings with
pencil lines, using the edge of the template as a
straightedge.
3. Drill Holes
Use a drill with a 3/16 inch (5 mm) bit held
perpendicular to the panel and drill the six A and B
holes. Then, using a drill bit slightly larger than the
tip of your saw blade, drill one hole at each of two
diagonally opposite corners. The holes should barely
touch the inside edge of the penciled outline. Before
taking the next step, make sure that the six A and B
holes have been drilled.
4. Saw the Panel Cutout
Saw carefully on the inside of the penciled lines.
First make the two long cuts and then the two short
cuts. After the rectangular opening has been cut out,
use a file to square the corners and smooth any
irregularities in the cut edges.
6 INSTALLATION
5. Install the Mounting Strips
In the hardware package you will find two mounting
strips, and two sets of machine screws. For panels
that are less than 1/2 inch (12.7 mm) thick, use the
3/4 inch (19.1 mm) screws; for panels that are more
than 1/2 inch (12.7 rnrn) thick, use the 1-1/4 inch (31.8
mm) screws.
the cabinet. Turn the PANLOC buttons
counterclockwise to unlock the instrument. It can
then slide outward to permit the removal of the
instrument from the cabinet.
Starting at the right-hand side of the panel, insert a
screw of the proper length into the center hole in
the panel, marked B on the template. On the back of
the panel, align a mounting strip with the holes in
the panel and tighten the screw until the screwhead
is pulled into the wood.
Repeat this procedure to attach the mounting strip
to the left side of the panel.
6. Attach the PANLOC Brackets
Using two screws of the proper length in the A holes
on each side, attach the PANLOC brackets to the
cabinet panel; the short flange is mounted against
the front (face) of the cabinet panel. The screws pass
through the PANLOC bracket flange, the cabinet
panel, and then through the mounting strips
previously mounted.
7. Install the Instrument
Guide the AC power cord through the panel opening
to the back of the cabinet; then, slide the instrument
into the opening carefully so that the rails on the bottom of each side of the chassis engage the tracks on
the mounting brackets. Continue to slide the
instrument into the cabinet until the front panel is
flush with the cabinet panel. Turn the PANLOC
buttons at the lower left and right corners of the
instrument panel clockwise to lock the unit firmly in
INSTALLATION 7
Fold out the photographs on the inside of the back
cover. It will assist you in locating the controls and
pushbuttons. The numbers and letters on the photographs refer to the paragraphs that follow.
There are four fields of audio connectors on the back
panel of the C 34V for use with associated equipment:
AUDIO INPUTS, EXTERNAL PROCESSORS, AUDIO
OUTPUTS, and MONITOR AMPLIFIER. On the front
panel are four additional phone jacks; two for use with
an additional audio tape recorder and two for use with
headphones.
Use shielded cables to interconnect the source equipment and the preamplifier, To minimize the possibility
of hum or noise, the shielded cables should be of
parallel construction or if not loosely twist the left and
right cables together. Locate them away from the
speaker connecting cables and AC power cords. Be certain to use good quality shielded cables for all interconnections. Your dealer can advise you on the kind and
length of cable that will best suit your installation.
AUDIO INPUTS
1. TURNTABLE:
Connect the cable from the turntable left channel
to the Left PHONO INPUT. Connect the cable from
the turntable right channel to the Right PHONO INPUT. 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 the
cable from the tuner right channel output to the
Right 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 channel
output 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 channel cable to the Left TV INPUT. Connect the right
channel cable to Right TV INPUT.
The output of a monophonic TV set can be connected to both left and right channel TV INPUTS by
use of a "Y" connector.
5. VCR 1/TAPE 1:
To Playback/Monitor: connect the cable from the
tape recorder left channel output to the Left
VCR 1/TAPE 1 INPUT. Connect the cable from the
tape recorder right channel output to the Right
VCR 1/TAPE 1 INPUT. Connect a second and third
recorder in the same manner to the VCR 2/TAPE 2
INPUT and LASER/TAPE 3 INPUT.
To Record: connect the cable from the Left
VCR 1/TAPE 1 OUTPUT to the left high-level input
of the tape recorder. Connect the cable from the
Right VCR 1/TAPE 1 OUTPUT to the right input of
the tape recorder. Connect a second and third
recorder in the same manner to the VCR 2/TAPE 2
OUTPUT 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 on
the front panel. The front panel phone jacks are
designed 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 panel
TAPE 3 in phone jack, the circuit to the rear panel
LASER/TAPE 3 INPUT is disconnected, but inserting
a phone plug in the front panel TAPE 3 OUT phone
jack does not disconnect the rear panel TAPE 3
OUTPUT. Thus, it is possible to record from the
front panel TAPE 3 OUT phone jack and the rear
panel TAPE 3 OUTPUT at the same time but it is
not 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 audio
from a VCR. Connect the left channel audio output
from the VCR to the Left VCR 1/TAPE 1 INPUT.
Connect the right channel audio output from the
VCR to the Right VCR 1/TAPE 1 INPUT. If the VCR
has only a single audio output (mono), use a "Y"
connector to connect the program to both the left
and right input.
7. LASERVISION PLAYER:
The audio from a laser vision video disc player
can be connected to the LASER/TAPE 3 INPUT if
desired. Connect the cable from the left channel
audio output of a laser disc player to the Left
LASER/TAPE 3 INPUT. Connect the cable from the
right channel audio output of a laser disc player to
the Right LASER/TAPE 3 INPUT.
8. EXTERNAL PROCESSORS:
The second field of connectors are marked EXTERNAL PROCESSORS. There are two sets of EXTERNAL
PROCESSOR jacks, one set that affects the program
selected 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 or
any audio signal processing device. Be sure to
match the left to left and right to right channels
when connecting external processors.
The EXTERNAL PROCESSOR jacks have switching
contacts which allow the signal to pass through
them when there is nothing plugged into the jacks,
When an external processor is used, the program is
routed to the external processor from the EXTERNAL PROCESSOR TO jack and back by the EXTERNAL PROCESSOR FROM jack.
WHEN AN EXTERNAL PROCESSOR IS USED, IT
MUST BE TURNED ON FOR THE PROGRAM TO
BE 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 program
selected by the RECORD input selector. The MAIN
set of jacks connect the program selected by the
LISTEN input selector and connect to the power
amplifier. Output to the two sets of jacks (SWITCHED 1 and SWITCHED 2) controlled by the front panel
SPEAKER/OUTPUT 1 and 2 pushbuttons can be connected to additional power amplifiers for remote
area listening.
The Left MAIN jack is to be connected to the
amplifier left input jack. The Right MAIN jack is to
be connected to the amplifier right input jack.
Two additional stereo power amplifiers may be
connected in the same fashion to the SWITCHED
OUTPUT jacks. Audio output signal is supplied to
these jacks only when the front panel pushbutton
SPEAKER/OUTPUT 1 and/or 2 pushbuttons are
pressed in. This arrangement is useful to turn the
program on or off to its separate amplifiers and
loudspeakers.
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 per
channel across 8 ohms or 12.6 volts RMS to a 600
ohm line. For operation, see MONITOR AMPLIFIER
page 13.
The input to the MONITOR AMPLIFIER can be
selected from either the RECORD program, the
LISTEN program, or from a third source connected
to the EXTernal INPUT jacks on the rear panel. The
input selector switch is on the top panel of the C 34V.
The EXTernal INPUT May be used for program
sources not originating in the C 34V. One use could
be to connect the output of a time delay device for
back channel speakers.
The output of the MONITOR AMPLIFIER is fed to
the front panel HEADPHONE phone jacks, to the
red and black posicontact push connectors and to
the jacks marked OUTPUT. Connect the left
speaker lead to the black COMmon push connector
and the red L terminal. Connect the right speaker
lead to the black COMmon push connector and the
red R terminal.
The OUTPUT jacks can be connected to drive a
low impedance (8 to 600 W) unbalanced line.
11. GROUND:
The ground (GND) post on the rear panel is provided primarily for a turntable or record changer
that has a separate ground lead in addition to the
signal leads.
12. AC POWER:
Plug the preamplifier AC power cord into a 120
volt 60 Hz wall outlet. The plug blades are polarized so be certain the plug is fully inserted in the
outlet to prevent blade exposure.
CAUTION: TO PREVENT ELECTRIC SHOCK, DO
NOT USE THE (POLARIZED) PLUG ON THIS UNIT
WITH AN EXTENSION CORD, RECEPTACLE, OR
OTHER OUTLET UNLESS THE BLADES CAN BE
FULLY INSERTED TO PREVENT BLADE EXPOSURE.
Three types of AC power outlets are provided on
the back panel of the C 34V. Three are black, two
are red, and one is green.
The black outlets are switched on or off when the
C 34V is turned on and off. Use these to provide AC
power to amplifiers, CD players, or other accessories.
The power capacity of all the outlets, totalled, is 1440
watts. The green outlet has a maximum capacity of
100 watts. For power consumption above 1440 watts,
it is necessary to add a Mclntosh SCR 2 (SPEAKER
CONTROL RELAY). The SCR 2 has two AC power
outlets that provide additional capacity of 1800 watts
switched on or off by the C 34V. Use these outlets to
supply AC power to amplifiers or other components
whenever the total load to be switched exceeds the
C 34V rating of 1440 watts.
The red outlets are on at all times and are used
with accessories that have their own power switches.
For example, a VCR should be plugged into one of
these outlets for it to be able to record TV programs
when the main audio system is turned off.
HOW TO CONNECT 9
The green AC power outlet is on at all times and
is used for turntable power. Do not use this outlet
for any other purpose. When the turntable power
cord is plugged into the green AC outlet, the turntable can be used as an alternate way to switch the
AC power to the entire system on or off. When the
turntable power is turned on, a sensor circuit in the
C 34V will detect the current drain of the turntable
motor and will turn on the C 34V the same way the
red POWER pushbutton does. The red power
pushbutton must be in the OFF or out position. As
long as a turntable is connected to the green AC
outlet, the turntable current will always override the
red POWER pushbutton and turn the system on.
Some turntables draw the same or very nearly the
same current whether on or off. AUTO TURN-ON
control is not possible with this type of turntable.
Use one of the red unswitched AC outlets instead of
the green.
speakers and TO REMOTE SPEAKER terminal to a
remote area pair of speakers. Connect the power
amplifier output to FROM POWER AMPLIFIER terminal strip. Maintain left and right orientation and
like polarity. Pushbutton SPEAKER 1 will turn the
main speakers on or off and SPEAKER 2 pushbutton
will 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 programs as well as audio. The MVS-1 connects to the
VIDEO SELECTOR computer-type connector on the
rear of the C 34V. Follow the instruction packet
with the MVS-1 for connecting the video cables,
13. FUSE:
A 1.0 AMP fast-acting fuse protects the C 34V
turntable current sensing circuits and the green AC
turntable outlet. This fuse must be replaced with the
same type and rating 1.0 AMP fast-acting fuse. Do
not use SLO BLO fuses. The fuse does not protect
equipment connected to the black AC outlet.
14. OPTIONAL ACCESSORIES:
ADDITIONAL AC POWER AND SPEAKER
SWITCHING WITH THE SPEAKER CONTROL
RELAY
The SPEAKER CONTROL RELAY, or SCR 2, is
designed to provide both speaker control switching
and high power switched AC outlets.
The SCR 2 also has two AC power outlets that
provide additional capacity of 2400 watts switched
by the C 34V. Use these outlets to supply AC power
to amplifiers or other components when the total
load switched exceeds the C 34V rating of 1440
watts. Plug the 4-prong plug on the cable attached
to the SCR 2 into the SCR 2 socket on the rear of
the C 34V. Plug the SCR 2 heavy, AC power line
cord directly into a wall outlet. Do not plug it into
the C 34V. When the C 34V is turned on, power
from the C 34V will energize a relay in the SCR 2
which connects the two SCR 2 AC outlets directly to
the wall outlet.
Two loudspeakers can be turned on or off with the
SCR 2 by using the front panel pushbuttons SPEAKER/OUTPUT 1 and 2. Use the TO MAIN SPEAKERS
terminal strip to connect the main listening pair of
10 HOW TO CONNECT
Fold out the photographs on the inside of the back
cover. It will assist you in locating the controls and
pushbuttons. The letters on the photographs refer to
the paragraphs that follow.
Before attempting to operate your C 34V Audio/Video
Control Center, familiarize yourself with the controls
and what they do.
A. LISTEN AND RECORD SELECTOR SWITCHES
The LISTEN Input selector switch is located at the
upper left on the front panel. It is used to select the
input for the LISTEN program line. The selected program source is fed to the MAIN output.
The RECORD input selector switch is located at
the lower left on the front panel. It is used to select
the input for the RECORD program line. The
selected program source is fed to the TAPE 1, TAPE
2, and TAPE 3 outputs. The RECORD and LISTEN
switches operate totally independently of each other
and without any interference.
B. MODE SELECTOR
The MODE SELECTOR allows you to identify each
stereo channel, create monophonic program
material, and direct program material to one channel or the other. The MODE SELECTOR operates
only 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 output
circuit.
STEREO: Connects the left input to the left output
circuit 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 input
and connects the composite to both left and right
output circuits.
L + R TO L: Connects the left plus right program
to the left output circuit only.
L + R TO R: Connects the left plus right program
to the right output circuit only.
C. EQUALIZER FREQUENCY CONTROLS
Each of five EQUALIZER FREQUENCY controls
raises or lowers the amplitude of a band of frequencies centered on the frequency marked above the
control. Both left and right channels are affected.
The center, or flat position of the control has a detent for easy reference. In the center or detent position, the entire circuit for that control is removed
from the program circuit by grounding the control
electronically. The result is the "straight wire with
gain" or the flexibility of complete musical balancing to your taste.
Use the EQUALIZER FREQUENCY controls to
modify the sound and balance of program material.
Here are some suggestions:
Adjustment to
__
Equalizer Correction
Make deep bass louder
Raise 30
Make all bass louder
Raise 30 and 150
Reinforce voices
Lower 150 and raise 500
Hum on program
Reduce 30 and 150
Brighten violins
and trumpets
Raise 1500
Emphasize cymbals
Raise 10 K
The EQUALIZER FREQUENCY controls can be
switched to either the LISTEN or RECORD program
lines by the RECORD EQUALIZER pushbutton.
Because the equalizer is in the circuit after the COMPANDOR, use of the equalizer will not affect the performance characteristics of the COMPANDOR.
D. BALANCE AND LOUDNESS
The BALANCE and LOUDNESS controls are concentric. The BALANCE control (large outer knob)
adjusts the volume of the channels relative to each
other.
L-left...turning the control to the left accents the
left channel by reducing the right channel output.
R-right...turning the control to the right accents
the right channel by reducing the left channel
output.
E. LOUDNESS
The LOUDNESS control (small center knob) provides frequency response contoured to compensate
for the behavior of the human ear at lower listening
levels. This contour is accurately modeled after the
family of "equal loudness" curves identified by Fletcher and Munson. At the fully counterclockwise
detented FLAT position, the loudness contour is
electrically flat. As the control is turned clockwise,
both bass and treble frequencies increase in the
correct proportion. The contour is not affected by
different settings of the VOLUME control. After setting the VOLUME control for the desired listening
level, adjust the LOUDNESS control for the preferred compensation.
F. COMPANDOR SYSTEM:
The Mclntosh COMPANDOR System can be used
to control the dynamic range of program material. It
can be used in two different ways: to function as an
FRONT PANEL CONTROLS 11
expander or as a compressor. Expansion can restore
the dynamic range limited by the process of recording both records and tape or broadcasting of music.
Compression decreases dynamic range. It can be
used for making tape recordings or for listening to
background music. The Compandor can be
switched to either the RECORD or LISTEN lines, by
means of the COMPANDOR pushbutton.
The Compandor System has four controls. The
concentric three-position COMPANDOR switch and
RATIO control are located on the front panel. The
LEVEL MATCH control and SPEED selector are located on the C 34V top panel.
COMPANDOR SELECTOR
The outer COMPANDOR knob can be set to EXPAND, OFF, or COMPRESS. When the COMPANDOR switch is in EXPAND or COMPRESS, a red
light will appear above the LISten-or RECord COMPANDOR pushbutton. In the center OFF position,
the Compandor System is switched out of the circuit
and the lights will be out. When the Compandor is
not used, the selector should be placed in the OFF
position.
RATIO CONTROL
The inner RATIO knob is used to control the
amount of expansion or compression.
LEVEL MATCH
The LEVEL MATCH control on the top panel is
used to adjust the listening level when the expander
or compressor is switched in or out of the circuit.
SPEED
The SPEED selector on the top panel is used to
control the rate at which the Compandor System responds to signals. By switching from FAST to NORMAL to SLOW, a more gradual rate of change in expansion or compression occurs. For music with percussive instruments, such as piano, drums, guitar,
etc., use NORMAL or FAST. In the FAST mode, the
Compandor System follows changes quickly but will
track low frequencies less accurately. Nonpercussive music and voice require slower speed.
At SLOW speed the low frequency tracking is accurate, but the rate of response is slower. The NORMAL position is best suited for most program
material.
USING THE COMPANDOR AS AN EXPANDER
When the COMPANDOR selector switch is in the
EXPAND position, the RATIO control is used to
select the amount of expansion. Full counterclockwise rotation corresponds to a ratio of 1.0. This
means that the dynamic range of the expander output is the same as the dynamic range of its input.
With the VOLUME control at a normal listening
level, the RATIO control is turned clockwise, the
output dynamic range becomes greater than the input. Set the RATIO control to the desired expansion
(usually between 1.2 and 1.5). Now switch the
COMPANDOR selector knob between EXPAND and
OFF. A change in the average listening level will
usually be heard. Adjust the LEVEL MATCH (on the
top panel) control until the average listening levels
match as closely as possible when in EXPAND and
OFF. After this adjustment, you will notice that with
the expander on, loud passages will be louder and
soft passages will be softer tending to make any
background noise quieter.
When the RATIO control is at the fully clockwise
position, it corresponds to a ratio of 2.0. The output
dynamic range is then twice the input dynamic
range. This setting is extreme for most program
material.
USING THE COMPANDOR AS A COMPRESSOR
When the COMPANDOR selector switch is in the
COMPRESS position, the RATIO control is used to
select the reduction in dynamic range desired. Full
counterclockwise rotation corresponds to a ratio of
1.0. The compressor output and input dynamic
range will be the same. Set the VOLUME control to
a normal listening level. As the RATIO control is
turned clockwise, the output dynamic range becomes less than the input range. Set the RATIO
control to the desired amount of compression.
Switch the COMPANDOR selector knob between
COMPRESS and OFF. A change in the average listening level will usually be heard. Adjust the LEVEL
MATCH control until the average listening levels
match as closely as possible when switching between COMPRESS and OFF. After this adjustment,
you will notice that with COMPRESS on, loud
passages will be softer and soft passages will be
louder.
When the RATIO control is at the fully clockwise
position it corresponds to a ratio of 2.0. The output
dynamic range is then one half of the input range.
This setting can be useful to create highly compressed tape recordings particularly useful in noisy locations such as automobiles, etc.
Two examples for using the expander are:
1. To reduce background noise (hum, hiss or
scratch):
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 EXPAND. The Listen indicator will light over the
COMPANDOR pushbutton.
d. Rotate the RATIO control clockwise until the
noise is acceptably reduced.
e. Adjust the LEVEL MATCH control as
previously described.
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 as
previously described.
2. To improve the sound of recorded or broadcast
TOP PANEL CONTROLS
COMPANDOR
Operation of the LEVEL MATCH and SPEED controls
is explained on page 12. See the Compandor System
description.
MONITOR AMPLIFIER
The built-in MONITOR AMPLIFIER can drive headphones, loudspeakers, or provide a low impedance line
output. A top panel input position switch selects the input for the MONITOR AMPLIFIER. The sources are the
LISTEN program line, the RECORD program line, or any
high level EXTERNAL source. When using headphones
plugged into the front panel jacks, the normal position
is LISTEN.
The monitor amplifier LEFT and RIGHT CAIN controls
are located to the left of the INPUT switch on the top
panel. When the switch is in the LISTEN position, the
LEFT and RIGHT GAIN controls regulate the monitor
volume along with the main front panel VOLUME control. When the INPUT switch is in the RECORD or EXTERNAL position, only the LEFT and RIGHT GAIN controls regulate the monitor amplifier volume.
The monitor amplifier can be used with any low impedance dynamic headphones. High impedance headphones will work but at reduced listening levels.
FRONT PANEL CONTROLS 13
G. COMPANDOR
The COMPANDOR pushbutton switches the
COMPANDOR circuits between the LISTEN (out
position) and RECORD (in position) program lines or
disconnects the circuit entirely. A red light emitting
diode (LED) illuminates to indicate when the circuit
is connected to either Listen or RECord. When
neither is lit, the COMPANDOR selector knob is
turned to the OFF position.
H. RECord EQUAL
The EQUALIZER FREQUENCY pushbutton connects these controls to the LISTEN or RECORD program lines. When the pushbutton is out, the
EQUALIZER FREQUENCY controls are connected to
the LISTEN line, and the red LED indicator above
the button is off. When the pushbutton is in, they
are connected to the RECORD line. The red LED indicator will be on. The normal position is with the
pushbutton out.
1.
RECord MONITOR
To monitor while recording with a three-head
tape recorder, set the LISTEN input selector to the
proper TAPE position. The RECord MONITOR LED
indicator is off when listening to the program
recorded on the tape and on when listening to the
program source being fed to the tape recorder.
J.
LF FILTER
remote speakers when an optional Speaker Control
Relay (SCR 2) is used.
The SWITCHED 1 and 2 jacks on the rear panel
of the C 34V have the same program as the MAIN
OUTPUT. When one or both SPEAKER/OUTPUT
pushbuttons are IN, the LISTEN program line is connected to the corresponding pair of OUTPUT jacks
and the LED indicator is turned on. Program to
other devices can be controlled such as rear channel delay, reverberation, etc. Example: connect the
SWITCHED 1 jack to the input of a reverberation
device and the output of the reverberation device
to the input C 34V MONITOR AMPLIFIER and the
output of the MONITOR AMPLIFIER to a set of rear
loudspeakers. (The monitor amplifier switch must be
in the EXTERNAL position.) Rear channel reverberation can then be switched on or off by the SPEAKER
OUTPUT 1 pushbutton without the need for an additional amplifier.
N. POWER ON
The red pushbutton turns the C 34V on or off.
When the power is on, the panel illuminates and
the red light above this pushbutton will go on. The
turntable can also be used as a power switch. See
page 10.
The Low Frequency FILTER is in the LISTEN program line only. When the pushbutton is out, the
filter is out of the circuit and the red indicator light
will be off. When the pushbutton is in, the LF FILTER is in the circuit and the red light will be on.
The filter is effective for all frequencies below 50 Hz
and attenuates at the rate of 12 dB per octave. Use
it to reduce undesirable low frequency noise such
as rumble or mechanical feedback.
K.
HF FILTER
The High Frequency FILTER is in the LISTEN program line only. When the pushbutton is out, the HF
FILTER is out of the circuit and the red indicator
light is off. When the pushbutton is in, the HF FILTER is in the circuit and the red light is on. The
filter is effective for all frequencies above 7,000 Hz
and attenuates at the rate of 12 dB per octave. Use
it to reduce undesirable high frequency noise such
as record surface noise or tape hiss.
L. SPEAKER/OUTPUT 1 and 2
The SPEAKER/OUTPUT 1 and 2 pushbuttons can
be used to switch on or off either the AUDIO OUTPUT SWITCHED 1 and 2 jacks or the main and
14 PUSHBUTTONS
PERFORMANCE LIMITS
Performance limits are the maximum deviation from
perfection permitted for a Mclntosh instrument. We
promise you that when you purchase a new C 34V from
a Mclntosh franchised dealer, it will be capable of or
can be made capable of performance at or exceeding
these limits or you can return the unit and get your
money back. Mclntosh is the only manufacturer that
makes this statement.
20kHz, at 0.01% maximum harmonic distortion
FREQUENCY RESPONSE
+ 0 -0.2dB from 20Hz to 20,000Hz
SENSITIVITY
750mV for rated output (170mV IHF), input impedance is 27K ohms
SIGNAL TO NOISE RATIO, A-WEIGHTED
100dB below rated output (87dB IHF)
GENERAL INFORMATION
PREAMPLIFIER SECTION
FREQUENCY RESPONSE
+ 0, -0.5dB from 20Hz to 20,000Hz
MAXIMUM VOLTAGE OUTPUT
10 volts from 20Hz to 20,000Hz
TOTAL HARMONIC DISTORTION
0.01% maximum from 20Hz to 20,000Hz
at rated output
SENSITIVITY
Phono- 2mV for 2.5V rated output
(0.4mV IHF)
High Level- 250mV for 2.5V rated output
(50mV IHF)
SIGNAL TO NOISE RATIO, A-WEIGHTED
Phono- 90dB below 10mV input
(84dB IHF)
High Level- 100dB below rated output
(86dB IHF)
MAXIMUM INPUT SIGNAL
Phono- 100mV
High Level- 10 volts
INPUT IMPEDANCE
Phono- 47k ohms and 65pf capacitance
High Level- 50k ohms
EQUALIZATION CONTROLS
Variable 12dB boost to 12dB cut at center frequencies of 30, 150, 500, 1500, 10k Hz
COMPANDOR RATIOS
From 1:2 compression to 2:1 expansion
SEMICONDUCTOR COMPLEMENT
31 Bipolar Transistors
76 Field Effect Transistors
35 Integrated Circuits
107 Diodes
1 Silicon Controlled Rectifier (SCR 2)
AC POWER OUTLETS
1 green turntable current sensing, 100 watts
2 red unswitched
3 black switched
1440 watts total capacity
POWER REQUIREMENTS
120 volts, 50/60 Hz, 25 to 85 watts
MECHANICAL INFORMATION
SIZE:
16-1/8 inches wide (40.6 cm) by 5-7/16 inches high
(13.8 cm) by 13 inches deep (33 cm), from the
mounting surface, including PANLOC shelf and back
panel connectors. Knob clearance required is 1-1/4
inches (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) in
shipping carton
LF FILTER
Flat or roll-off at 12dB per octave below 50 Hz.
HF FILTER
Flat or roll-off at 12dB per octave above 7,000 Hz.
MONITOR AMPLIFIER SECTION
CONTINUOUS AVERAGE POWER OUTPUT
20 watts per channel into 8 ohms, from 20Hz to
PERFORMANCE LIMITS 15
16 PERFORMANCE CHARTS
PERFORMANCE CHARTS 17
The simplified block diagram on page 5 and the detailed block diagram on pages 20 and 21 show how the
C 34V internal circuits are arranged. The C 34V uses
separate program channels (referred to as "program
lines" in this manual) for "listening" and "recording".
This allows you to listen to any program source while
you 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 listen
program line only. The compandor, the five equalizer
frequency controls, and the monitor amplifier can be individually switched to the listen program line or the
record program line.
PHONO AMPLIFIER
This amplifier uses a high technology integrated circuit
operational amplifier. Its differential input stage has
been optimized for low noise and low distortion performance. Open loop gain of this integrated circuit is
100,000 times. With high open loop gain a large
amount of negative feedback is used around the phono
amplifier to further reduce noise and distortion. The
feedback network also provides precision RIAA frequency compensation. The network uses 1% metal film resistors and 5% poly film capacitors. To achieve low noise
performance it is essential that the feedback network
have very low impedance. As a consequence, the preamplifier must be capable of operating as a power
amplifier to drive this impedance. The actual power output capability of this preamplifier stage is more than 100
milliwatts, a great margin beyond that which is required.
Input sensitivity of the phono amplifier is 2.2 millivolts. The gain of the amplifier is 42 dB at 1000 Hz. The
phono amplifier has a very wide dynamic range. At
1000 Hz the phono input circuit will accept 100 millivolts without overload, a voltage far greater than the
output of any magnetic phono cartridge presently
available.
LISTEN AND RECORD SELECTOR SWITCHES
Input switching is accomplished electronically. Signals
from the 7 inputs connect to two arrays of Field Effect
Transistors (FET) to perform the switching. Control
signals from the listen and record selector switches turn
on the appropriate FET switches to pass the selected input signals. The other input signals are blocked by the
"off" FET switches. Each FET switch uses two cascaded
FET transistors to provide the required isolation and prevent cross talk between inputs. The FET "on" resistance
is very low which prevents distortion. The switching
transistors are located right at the input jacks, so that
signal wiring is kept to a minimum which eliminates
cross talk and noise problems.
LISTEN PROGRAM LINE
The listen program signal from the LISTEN input
switch goes to the COMPANDOR control switching
where the COMPANDOR can be inserted in either the
listen or the record program path. The COMPANDOR
circuit is described later.
The listen program then goes to the LISTEN EXTERNAL Processor jacks. When an EXTERNAL PROCESSOR
is used, the listen program leaves the C 34V through the
EXTERNAL processor TO jack and returns via the FROM
jack. If a processor is not used, the signal passes directly
through the switching contacts In the jacks.
The volume control is next in the listen path. It is a
step attenuator with left to right tracking accuracy better
than 1 dB throughout its entire range. Such extremely
accurate matching is achieved through electronically
controlled trimming of the resistance material deposited
on pairs of printed circuits within the control. Since the
switch commutator touches only contact pads and not
the actual resistance element, tracking accuracy is not
degraded with use as in ordinary volume controls.
The loudness control and its amplifiers follow the volume control. In the past, loudness controls have typically been simple passive circuits connected to a tap on
the volume control. As a consequence, compensation
accuracy was dependent on many variables such as
volume control position and differences in the input
level. The C 34V loudness control uses active circuits of
an integrated circuit operational amplifier with two feedback loops. One has flat frequency response, while the
other has response conforming to the Fletcher-Munson
equal loudness contours. A potentiometer is placed between these two feedback loops making it possible to
select any combination of the two, from a flat response
to full loudness compensation. The overall gain of the
stage is 20 dB at mid-frequencies and the average listening volume is not affected by the position of the
loudness control.
The listen program signals next pass to the balance
control and then to the equalizer amplifier composed of
a low noise operational amplifier with flat response and
unity gain. Five other operational amplifiers are arranged in circuit configurations that are equivalent to five
series tuned circuits, each at one of the equalizer frequencies. These series tuned circuits are inserted via
control potentiometers into either the input circuit or
feedback circuit of the equalizer amplifier to provide a
boost or cut capability of 12 dB for each equalizer band
18 TECHNICAL DESCRIPTION
of frequencies. A pushbutton switch allows the
equalizer circuit to be switched from the listen program
line 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 frequencies
below 50 Hz at a rate of 12 dB per octave. The HF
Filter attenuates frequencies above 7 kHz at a rate of 12
dB per octave.
The listen program signal then is fed to the main output jacks. The OUTPUT 1 and OUTPUT 2 jacks receive
the same signal but can be turned on or off by the
Speaker/Output 1 and 2 pushbuttons.
RECORD PROGRAM LINE
The RECORD program signal from the RECORD input
switch goes first through a unity gain amplifier and then
to the COMPANDOR switching where the Compandor
can be inserted into the record program path. The
Compandor circuit is described later. The record program then goes to the RECORD EXTERNAL PROCESSOR
jacks. These jacks, like the LISTEN EXTERNAL PROCESSOR jacks, have switching contacts so that the signal
passes through when plugs are not inserted in the jacks.
When an external processor is used, the record program leaves the C 34V through the EXTERNAL PROCESSOR TO jack and returns via the FROM jack. When
a processor is not connected, the signal passes directly
through the jacks.
An equalizer amplifier with unity gain follows. A
pushbutton switch allows the 5 band equalizer controls
to be switched from the Listen program line to the
Record program line. This feature allows equalizing the
record signal before it is fed to a recorder.
The equalizer amplifier feeds to electronic interlock
switching and then finally to the record output jacks.
The switching is arranged so that if the Record input
selector is positioned to select the output of a recorder,
the Record program line will not feed the record output
jack connected to that recorder. This prevents recorder
feedback.
COMPANDOR
The Compandor will expand or compress the
dynamic range of the program material. The Compandor can be switched to the Listen or Record program
lines or turned off. Program to the Compandor is applied to a voltage controlled amplifier (VCA) which
operates as a variable gain block. Control voltages for
this VCA are developed from a sample taken from the
left and right channel input signals to the VCA. The
electronic processing of this sample is detailed. It in-
cludes band shaping, logarithmic conversion, full wave
rectification, level setting, expansion or compression
ratio regulation, attack timing, and DC amplification.
The resulting processed voltage controls the gain of the
VCA to cause logarithmic gain expansion when expanding the program, or the opposite, logarithmic gain
compression when compressing the program.
MONITOR AMPLIFIER
The monitor amplifier is a 20 watt per channel stereo
power amplifier. The monitor input selector switch
allows the amplifier to be driven from the LISTEN or
RECORD program lines or from an external input. It is a
push pull complementary class AB amplifier using a differential input stage. The amplifier includes the Mclntosh Power Guard* protection circuit. The Power Guard
circuit compares the amplifier output signal with its input signal. If there is a difference between the
waveforms of these signals, Power Guard activates an
electronic attenuator at the input of the amplifier which
reduces the amplifier input level. This automatic control
system makes it impossible to drive the monitor
amplifier into clipping. Thus, clipping distortion and
loudspeaker damage due to clipping are eliminated.
AUTO TURN-ON
A turntable plugged into the green outlet at the rear
of the C 34V can control the on-off operation of the
C 34V. Current flow to the turntable is sensed and controls a silicon control rectifier (SCR). When the SCR conducts a relay closes. This relay turns on power to the
C 34V and to the black AC power outlets. Power is also
controlled 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 OF
CONTROLS AND PUSHBUTTONS
The numbers and letters correspond to the paragraphs on pages 8, 9, 10, 11 and 12.
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