McIntosh-C36-Owners-Manual
C36
AUDIO CONTROL
CENTER
C36
AUDIO CONTROL
CENTER
IMPORTANT
SAFETY
INSTRUCTIONS
THESE
INSTRUCTIONS
ARE TO PROTECT
YOU AND THE
MclNTOSH
INSTRUMENT.
BE SURE TO
FAMILIARIZE
YOURSELF
WITH THEM
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
Read all instructions - Read the safety and operating instructions before operating the instrument.
Retain Instructions - Retain the safety and operating instructions for future reference.
Heed warnings - Adhere to warnings and operating instructions.
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.
Power Sources - Connect the power supply only to the type described in the operating instructions
or as marked on the unit.
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.
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.
Heat - Locate the instrument away from heat sources such as radiators, heat registers, stoves, or
other appliance (including amplifiers) that produce heat.
Wall or Cabinet Mounting - Mount the instrument in a wall or cabinet only as described in the owner's
manual.
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.
Cleaning - Clean the instrument by dusting with a dry cloth. Clean the panel with a cloth moistened
with a window cleaner.
Object and Liquid Entry - Do not permit objects to fall and liquids to spill into the instrument through
enclosure openings.
Nonuse Periods - Unplug the power cord from the AC power outlet when left unused for a long period
of time.
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.
Servicing - Do not attempt to service beyond that described in the operating instructions. All other
service should be referred to qualified service personnel.
Grounding or Polarization - Do not defeat the inherent design features of the polarized plug. Nonpolarized line cord adaptors will defeat the safety provided by the polarized AC plug.
17. C A U T I O N : TO PREVENT ELECTRICAL 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.
A T T E N T I O N : 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 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.
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.
Copyright 1992 © by
Mclntosh Laboratory Inc.
WARNING: THIS UNIT IS CAPABLE OF PRODUCING HIGH SOUND
PRESSURE LEVELS. CONTINUED EXPOSURE TO HIGH SOUND
PRESSURE LEVELS CAN CAUSE PERMANENT HEARING IMPAIRMENT
OR LOSS. USER CAUTION IS ADVISED AND EAR PROTECTION IS
RECOMMENDED WHEN PLAYING AT HIGH VOLUMES.
2
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
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.
SERVICE CONTRACT
4
INTRODUCTION
5
INSTALLATION
FRONT PANEL CONTROLS
HOW TO MAKE CONNECTIONS ON THE REAR PANEL
5, 6, 7
8,9
9, 10, 11
SPECIFICATIONS
12
PERFORMANCE CHARTS
13
TECHNICAL DESCRIPTION
BLOCK DIAGRAMS
14, 15
16, 17, 18
3
TABLE OF
CONTENTS
TAKE ADVANTAGE OF 3 YEARS OF CONTRACT SERVICE. . .
FILL IN THE APPLICATION NOW.
Your C36 Audio Control Center will give you many years of satisfactory performance. If you
have any questions, please contact,
Mclntosh Laboratory Inc.
2 Chambers Street
Binghamton, New York 13903-2699
Phone: 607-723-3512
MclNTOSH
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 Mclntosh 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
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.
4
Mclntosh has earned world renown for its technical contributions to improved sound
reproduction. When you bought Mclntosh, you bought not only high technology, but also
technological integrity proven by time. The Mclntosh C36 Audio Control Center is the newest
evidence of Mclntosh engineering excellence.
INTRODUCTION
Mclntosh audio products have always been designed for the best sound and superior
reliability. Dedication to achieving these goals since 1949 has earned Mclntosh the reputation for creating the finest quality products in the stereo industry. The Mclntosh "Classic"
design has also been recognized as the most outstanding in the industry.
Mclntosh products are designed to be maximum user friendly so anyone can easily enjoy
using them. Another Mclntosh design policy is to provide products that are easy to maintain.
The C36 Audio Control Center is simple, yet elegant. There are many useful features to
enhance your listening enjoyment.
There are nine pairs of high level inputs to accommodate the traditional program sources
as well as the most recent new sources. These include CD players, audio signals from laser
disc players and audio from video recorders. A low level input is also provided for a record
player with a magnetic phono cartridge.
DIGITAL LOGIC integrated circuits drive ELECTROMAGNETIC SWITCHES on all inputs
and operating functions for the most reliable, lowest distortion switching available today.
Separate Record and Listen circuits allow for recording from one source while listening
to another. A continuously variable Active Loudness control allows loudness compensation
to be selected for any setting of the volume control. The Loudness control circuit elements
are removed from the signal path when the control is in the flat or fully counterclockwise
position.
Bass and Treble tone controls provide 12dB of boost or cut. At the center or detent position of the tone controls, all tone control circuits are removed from the signal path.
Two Signal Processor loops are provided, one for RECORD signals and one for LISTEN
signals. Power supply voltage regulator circuits maintain stable operation even though the
AC power line may vary. A double shielded power transformer completely isolates it from
the audio circuits.
Front panel push buttons control two switched outputs as well as two pairs of speakers
when the optional SCR3 switching relay is added.
LOCATION
The C36 may be installed in a matching Mclntosh cabinet, or custom installed in furniture
of your choice. Always provide adequate ventilation for your Audio Control Center, even though
it generates little heat. Do not install the unit directly above heat generating components
such as high powered amplifiers. Allow at least 1 1/2 inches (3.8cm) space above the
preamplifier so cooling air flow is not obstructed. The recommended minimum space for installation is 18 1/2 inches (47cm) wide. 6 inches (15.3cm) high and 15 1/2 inches (40cm)
deep, including clearance for connectors. Allow 1 1/2 inches (3.8cm) in front of the mounting panel for knob clearance. The trouble free life of any electronic instrument is greatly
extended by providing sufficient ventilation. This prevents the build-up of internal temperatures
that can cause deterioration of circuit components.
5
INSTALLATION
INSTALLATION
MclNTOSH PANLOC MOUNTING SYSTEM
The PANLOC system of installing equipment is a product of Mclntosh research. Two steel
PANLOC mounting shelves are attached to the front panel at each side of the panel cutout,
using the screws and brackets provided. The C36 has runners on the bottom of its chassis,
allowing it to slide into the shelves. When the unit has been positioned fully into the cabinet
and its front panel rests against the cabinet panel, it can be locked into position. Turn each
PANLOC button one-quarter turn clockwise to lock. Turn counterclockwise to unlock the unit
so it can be removed from the cabinet.
UNPACKING
Open the carton and remove the PANLOC shelves, the hardware package and the mounting template. Lift the C36 up off the shipping pallet and remove the plastic bag. The C36
is now ready for shelf or table top installation.
If the C36 is to be installed in a Mclntosh cabinet or custom installation, place it carefully
upside-down on a flat surface and unscrew the four plastic feet.
INSTALLING IN A MclNTOSH CABINET
Install the PANLOC shelves to the front side of the two brackets attached to the left and
right inside edges of the cabinet. Use the four 6/32 by 1-1/4 inch (32.8mm) fillister head screws
included in the hardware package.
Guide the C36 AC power cord through the front panel opening, to the back of the back
of the cabinet. Slide the unit into the opening, making sure the rails on the bottom of each
side of the amplifier chassis engage the tracks on the PANLOC shelves. Slide the unit completely into the cabinet until the back edge of its front panel is pressing gently against the
front of the cabinet panel. Turn the PANLOC buttons approximately one quarter turn clockwise
to lock the unit in the cabinet. Turn the PANLOC buttons one quarter turn counterclockwise
to unlock the unit so it can be removed from the cabinet.
CUSTOM INSTALLATION
1. MARK THE CABINET FRONT PANEL
Tape the plastic mounting template to the cabinet panel in the position where the unit is
to be mounted. The broken lines that represent the outline of the rectangular cutout also represent the outside dimensions of the C36 chassis. Make sure these lines clear any shelves,
partitions or any other equipment mounted in the same cabinet. 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 a ruler or straightedge.
6
2. DRILL THE HOLES
Use a drill with a 3/16 inch (5mm) bit. Drill perpendicular to the front panel 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, be sure the six A and B holes have been
drilled.
3. SAW THE PANEL CUTOUT
First make the two long horizontal cuts. Then make the two short vertical cuts. After the
cutout is finished, use a tile to square the corners and smooth any rough edges.
4. INSTALL THE PANLOC MOUNTING STRIPS
The hardware package includes two
mounting strips and two black flat head
6/32 x 1-1/4 inch (31.8mm) screws and
four 6/32 x 1-1/4 inch (31.8mm) fillister
head screws. Place a mounting strip
behind each edge of the cutout and
secure it to the back side of the panel inserting a black flat head 6/32 screw
through the center holes marked B on the
template. Make sure the screws are drawn flush or slightly into the wood before attaching
the PANLOC shelves.
5. ATTACH THE PANLOC SHELVES
Position the PANLOC shelves inside the
cutout with the short flange against the
front face of the cabinet panel. Fasten the
shelves by inserting two fillister head 6/32
screws through the holes in each of the
PANLOC shelf flanges, through the front
panel and into the threaded receptacle on
the mounting strips.
6. INSTALL THE C36
Guide the C36 AC power cord through the panel opening to the back of the cabinet. Slide
the unit into the opening, making sure the rails on the bottom of each side of the chassis
engage the tracks on the PANLOC shelves. Slide the unit completely into the cabinet until
the back side of its front panel is pressing gently against the front of the cabinet panel. Turn
the PANLOC buttons approximately one-quarter turn clockwise to lock the unit in the cabinet.
Turn the PANLOC buttons one-quarter turn counterclockwise to unlock the unit so it can be
removed from the cabinet.
7
INSTALLATION
FRONT
PANEL
CONTROLS
The back cover of this manual folds out to show photographs of the front and rear
panels of the C36. Fold it out to assist you in identifying and locating the controls
and switches on the C36 front panel, and the connectors on the rear panel. The letters and numbers on the photographs refer to the paragraphs that follow.
A.
BASS AND TREBLE
Provide 12dB boost and cut. with neutral center detent position.
B.
RECORD
Selects the program signal that will feed to the TAPE 1 and 2 OUTPUTS.
C.
LISTEN
Selects the program signal that feeds the MAIN and SWITCHED 1 and 2 OUTPUTS.
D.
VOLUME
Adjusts the volume level at the MAIN and SWITCHED 1 and 2 OUTPUTS. The TAPE OUTPUTS are not affected by the VOLUME control settings.
E and F. LOUD (Loudness) and BALANCE (concentric controls)
The BALANCE control, (large outer knob), adjusts the volume of the channels relative to
each other.
L, (left): Turn the control to the left to accent the left channel by reducing the volume of
the right channel.
R, (right): Turn the right to accent the right channel by reducing the volume in the left channel.
The LOUDness control, (small inner knob), provides frequency response contoured to compensate for the behavior of the human ear at softer listening levels. At the fully
counterclockwise detent position, the frequency response is perfectly flat and the loudness
circuit components are removed from the signal path. Turn the control clockwise to increase
both bass and treble frequencies in the correct proportion for proper listening at softer volume
levels. The compensated frequency response is not affected by changes in the volume control settings. First adjust the volume for the desired listening level, then adjust the loudness
control to the setting you prefer.
THE FIVE PUSH BUTTONS ARE PRESS AND RELEASE, WITH LED INDICATORS TO
SHOW THE SELECTED OPERATING FUNCTIONS.
G. SPEAKERS 1 AND 2
Press SPEAKERS 1 to turn on the LISTEN SWITCHED OUTPUTS 1. These outputs allow
you to switch the C36 signals to other power amplifiers or accessories.
If the optional SCR3 Switching Relay is connected, the pair of speakers connected to the
speaker 1 terminals will turn ON. A green LED indicator will also illuminate next to the switch.
Press SPEAKERS 1 again to turn the speakers OFF.
Press SPEAKERS 2 to turn ON and OFF the second set of LISTEN SWITCHED OUTPUTS
or speakers in a similar manner.
H.
I.
POWER
Press the red POWER button to turn the C36 system ON. Press again to turn it OFF.
MONO (Monophonic)
Press the MONO button to add the left and right channel signals together for MONO signals
at the LISTEN MAIN, SWITCHED 1 and SWITCHED 2 OUTPUTS. A green LED indicator next
to the switch will illuminate to indicate the MONO mode of operation. The MONO switch does
not affect the TAPE outputs. They are always stereo.
8
J.
MUTE
Press the MUTE button to turn off the Main, Switched 1 and 2 outputs. A RED LED indicator left of the pushbutton will illuminate to indicate the MUTE condition. Press MUTE
again to restore normal sound. The TAPE outputs are not affected by the MUTE button.
K.
FRONT
PANEL
CONTROLS
HEADPHONES
Plug in a pair of low impedance dynamic headphones to this jack for headphone listening.
L.
PANLOC
Turn the PANLOC buttons approximately 1/4 turn clockwise to lock the C36 in place. Turn
the buttons counterclockwise to unlock the unit for removal.
Use good quality shielded cables to interconnect the associated equipment used with the
preamplifier. The installation of proper quality cables will insure the best possible performance
from your stereo system. Your dealer can advise you on the type and length of cables best
suited for your installation.
LISTEN FUNCTIONS
1.
MAIN OUTPUTS
Connect a cable from the C36 Left channel LISTEN MAIN OUTPUT to the Left channel
power amplifier input. Connect a cable from the C36 Right LISTEN MAIN OUTPUT to the
Right channel power amplifier input.
2.
SWITCHED 1 AND 2 OUTPUTS
Two additional power amplifiers or accessory components can be connected to the
SWITCHED 1 and 2 LISTEN OUTPUTS. Connect in a manner similar to the MAIN outputs.
Audio output signals are fed to these jacks only when the appropriate front panel SPEAKER
1 or 2 switches are pressed.
This switching capability is useful when additional power amplifiers are used to power
remote listening areas.
3.
PROCESSOR-FROM and TO
An external signal processor can be added to the C36 which will affect only the LISTEN
MAIN and SWITCHED 1 and 2 outputs.
The PROCESSOR-FROM jacks have built-in switching contacts to allow normal signals to
pass through when no cables are connected. When an external processor is properly connected, the program signals feed to the processor from the PROCESSOR-TO jacks, and return
to the C36 at the PROCESSOR-FROM jacks.
Connect a cable from the left channel processor output to the C36 left channel
PROCESSOR-FROM jack. Connect a cable from the right channel signal output to the C36
right channel PROCESSOR-FROM jack.
Connect a cable from the C36 left channel PROCESSOR-TO jack to the signal processor
left channel input. Connect a cable from the C36 right channel PROCESSOR-TO jack to the
right channel signal processor input.
WHEN AN EXTERNAL SIGNAL PROCESSOR IS CONNECTED TO THE C36, THE PROCESSOR MUST BE TURNED ON AND OPERATING FOR A PROGRAM TO BE HEARD
THROUGH THE SYSTEM.
9
HOW TO
MAKE
CONNECTIONS
ON THE
REAR PANEL
HOW TO
MAKE
CONNECTIONS
ON THE
REAR PANEL
RECORD FUNCTIONS
4. TAPE OUTPUTS 1, 2 and 3
These outputs provide signals to feed as many as three separate tape recorders. The program
that appears at the tape outputs is determined by the setting of the front panel RECORD switch.
Connect a cable from the C36 left channel TAPE 1 OUTPUT to the left channel high level
input of a tape recorder. Connect a cable from the C36 right channel TAPE 1 OUTPUT to
the right channel high level input of a tape recorder. Connect a second and third tape recorder
in a similar manner.
5. PROCESSOR-FROM AND TO
An external signal processor can be added to the C36 which will affect only the TAPE
RECORD OUTPUT jacks.
The PROCESSOR-FROM jacks have built-in switching contacts to allow normal signals to
pass through when no cables are connected. When an external processor is properly connected, the program signals feed to the processor from the C36 PROCESSOR-TO jacks, and
return to the C36 at the PROCESSOR-FROM jacks.
Connect a cable from the left channel processor output to the C36 left channel
PROCESSOR-FROM jack. Connect a cable from the right channel processor output to the
right channel PROCESSOR-FROM jack.
Connect a cable from the C36 left channel PROCESSOR-TO jack to the left channel processor input. Connect a cable from the C36 right channel PROCESSOR-TO jack to the processor right channel input.
WHEN AN EXTERNAL SIGNAL PROCESSSOR IS CONNECTED TO THE C36, THE PROCESSOR MUST BE TURNED ON AND OPERATING FOR A PROGRAM TO BE FED TO
THE TAPE OUTPUTS.
AUDIO INPUTS
6. VIDEO
Use these inputs for the audio signals from accessories such as a Laser Disc Player, VCR,
or TV receiver.
Connect a cable from the left channel audio output of the video unit to the C36 L (Left)
channel VIDEO INPUT. Connect a cable from the right channel output to the C36 R (Right)
VIDEO INPUT.
7. TAPE 1, 2 and 3
Connect a cable from the left channel output of a tape recorder to the C36 L (Left) channel
TAPE 1, 2 or 3 INPUT. Connect a cable from the right channel output to the C36 R (Right)
TAPE 1, 2 or 3 INPUT
A total of three tape recorders can be connected to the C36. The Tape inputs can also
be used for other accessory equipment with similar output levels.
IF MORE THAN ONE TAPE RECORDER IS CONNECTED TO BOTH RECORD AND PLAY,
MAKE CERTAIN THAT THE INPUTS AND OUTPUTS ARE CONNECTED TO THE SAME
MATCHING NUMBERED JACKS.
8. TUNER
Connect a cable from the left channel output of a tuner to the C36 L (Left) TUNER INPUT.
Connect a cable from the right channel output to the C36 R (Right) TUNER INPUT.
9. CD1 and 2
Connect a cable from the left channel output of a CD player to the C36 L(Left)CD1 INPUT
Connect a cable from the right channel output to the C36 R (Right) CD1 INPUT. Connect a
second CD player to the C36 CD2 inputs in a similar manner.
10
For example, CD1 inputs could be used for a single play CD player, and the CD2 inputs
for a CD changer.
10. and 11. AUX (Auxiliary)/PH (Phono)
Both the PHono and Auxiliary input jacks are selected by the same position on the front
panel LISTEN knob- One or the other input can be used, but not both simultaneously.
Connect the left channel high level output of any audio accessory unit to the C36 L (Left)
Auxiliary INPUT. Connect the right channel accessory output to the C36 R (Right) Auxiliary
INPUT. When cables are connected to the AUX input jacks, the PHono circuit is automatically bypassed.
To connect a record player with a magnetic phono cartridge, FIRST, remove any connecting cables from the Auxiliary input jacks.
Connect a cable from the left channel turntable output to the C36 L (Left) PHono INPUT.
Connect a cable from the right channel to the C36 R (Right) PHono INPUT If there is a separate
ground wire from the turntable, connect it to the GND terminal.
The C36 phono input circuit is designed to accept the signals from a standard moving
magnet phono cartridge.
AC POWER
12. SCR (Optional Accessory)
The SPEAKER CONTROL RELAY, Model SCR3 is designed to provide switching for two
pairs of speakers using the C36 front panel SPEAKERS push buttons.
Two high current AC receptacles are also provided with 1800 watts current capacity to supply
other components such as large power amplifiers. These outlets turn on and off with the C36
power switch, and are to be used when the accessory components demand more current
than the 1500 watt rating of the C36 power switch.
Plug the computer type connector on the cable coming from the SCR3 into the SCR socket
on the C36 rear panel. Plug the heavy AC cable from the SCR3 into a wall outlet.
DO NOT PLUG THIS HEAVY CABLE INTO ANY OF THE C36 REAR PANEL AC SOCKETS
13. SWITCHED AC RECEPTACLES
Eight AC receptacles are provided for accessory equipment. These receptacles turn on
and off with the C36 Power switch.
14. UNSWITCHED AC RECEPTACLE
This AC receptacle will stay on at all times as long as the C36 power cord is connected
to a live 60Hz power outlet. For example, this outlet could be used for a VCR that is programmed
for future recording of a TV show when the main stereo system is turned off- You can also
use this outlet for a record changer that has its own automatic shutoff feature.
THE TOTAL POWER CONSUMPTION OF ALL THE ACCESSORIES CONNECTED TO THE
C36 BACK PANEL OUTLETS MUST NOT EXCEED 12.5 AMPERES OR 1500 WATTS.
15. AC POWER
Plug the C36 AC power cord into a 120 volt 60Hz 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 CONNECT THE POLARIZED AC
PLUG ON THIS UNIT TO AN EXTENSION CORD OR OTHER AC OUTLET THAT IS NOT
DESIGNED TO ACCEPT POLARIZED PLUGS. THE PLUG MUST BE FULLY INSERTED
TO PREVENT BLADE EXPOSURE AND MAINTAIN LINE POLARITY.
11
HOW TO
MAKE
CONNECTIONS
ON THE
REAR PANEL
SPECIFICATIONS
PERFORMANCE LIMITS
Performance limits are the maximum
deviation from perfection permitted for a
Mclntosh instrument. We promise you that
when you purchase a new C36 from a Mclntosh Franchised Dealer, it will be capable of
performance at or better than these limits.
RATED OUTPUT
2.5V at MAIN and SWITCHED 1 and 2
Outputs
MAXIMUM VOLTAGE OUTPUT
8V from 20Hz to 20,000Hz at MAIN and
SWITCHED 1 and 2 Outputs
to
SENSITIVITY
Phono: 2.5mV for 2.5V rated output,
(0.5mV 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: 105dB below rated output,
(95dB IHF)
MAXIMUM INPUT SIGNAL
Phono: 90mV
High Level: 10V
INPUT IMPEDANCE
Phono: 47K ohms and 65pF Capacitance
High Level: 22K ohms
VOLTAGE GAIN
Phono To Tape: 40dB
Phono To Main: 60dB
High Level To Tape: 0dB
High Level To Main: 20dB
TONE CONTROLS
Bass and Treble variable 12dB boost to
12dB cut
12
POWER REQUIREMENTS
120 Volts, 50/60Hz, 15 watts
MECHANICAL
FREQUENCY RESPONSE
+ 0, -0.5dB from 20Hz to 20,000Hz
TOTAL HARMONIC DISTORTION
0.002% maximum from 20Hz
20,000Hz at rated output
AC POWER OUTLETS
8 switched and 1 unswitched
Total current capacity 12.5 amperes,
(1500 watts)
SIZE
Front Panel measures 17-1/2 inches
(44.5cm) wide by 5-3/8 inches (13.7cm) high.
Chassis depth behind the mounting panel,
including clearance for connectors, is 15-1/2
inches (40cm). Knob clearance required in
front of mounting panel is 1-1/2 inches
(3.8cm).
FINISH
Top section of front panel is glass with
gold/teal nomenclature illumination. Bottom
section is anodized aluminum. The chassis
is black.
MOUNTING
Exclusive Mclntosh developed PANLOC.
WEIGHT
14.5 pounds (6.6Kg) net, 26.5 pounds
(12Kg) in shipping carton
PERFORMANCE
CHARTS
13
TECHNICAL
DESCRIPTION
LOGIC DRIVEN CONTROL
All inputs, outputs and mode switching on the C36 are controlled by logic circuits that drive
the electromagnetic switches. The front panel Record and Listen switches feed a pulse to
a binary up-down counter, then to a binary decimal decoder, and finally to a transistor array
that controls signals to the electromagnetic switches. The C36 pushbutton switches feed a
momentary pulse to control the electromagnetic switches for their specific functions.
ELECTRO-MAGNETIC SWITCHING
All signal switching in the C36 is done by ELECTRO-MAGNETIC methods. ELECTROMAGNETIC switching is an old and proven technology that has been blessed with modern
materials and manufacturing methods.
Each switch consists of a sealed glass tube that is filled with an inert oxygen free atmosphere, and sealed with tiny leads protruding from either end- These leads extend into
the tube and overlap one another with a separation of a few thousandths of an inch. The
leads are made from a ferrous material that is influenced by a magnetic field. They are first
plated with gold as a base material, then with rhodium and ruthenium. Ruthenium is the best
contact material known. The glass assembly is then placed in the center of a multi-layer coil
of copper wire. The entire assembly is molded together in a tough shock absorbing plastic.
The switch and coil connections extend from the bottom in the form of printed circuit board
terminals.
When a DC voltage is applied to the coil, current flows and creates a magnetic field. The
force of the field causes the leads to bend and contact one another inside the sealed glass
tube. The inert oxygen free atmosphere eliminates corrosion of the contacts, insuring a low
resistance, distortion free switch.
PHONO PREAMPLIFIER
The phono preamplifier uses a high technology integrated circuit operational amplifier that
has an extremely wide frequency range capability. Its differential input stage has been optimized for low noise and low distortion. The open loop gain for this circuit is 100,000. With
high open loop gain, a large amount of negative feedback can be used around this preamplifier
section to reduce noise and distortion to an extremely low value. The feedback network also
provides precision RIAA frequency equalization which follows the required response curve
very accurately throughout the entire audio range. The network uses 1% tolerance metal film
resistors and 5% tolerance polypropylene capacitors.
To achieve low-noise performance, it is essential that the feedback network have very low
impedance. A circuit design of this type acts as a small power amplifier. This preamplifier
section will actually produce more than 100 milliwatts output power. This extra margin of performance results in a phono preamplifier with extremely low distortion and noise.
This preamplifier circuit has a very wide dynamic range. It will accept up to 90 millivolts
of input signal without overload. This is far greater than the maximum output voltage capability
of any current model magnatic phono cartridge.
The sensitivity of this circuit is 2.5 millivolts for 2.5 volts at the main output. The gain is
40dB at 1000Hz. A signal input of 10 millivolts results in 1 volt at the Tape Outputs. The Tape
Output source impedance of the phono preamplifier is 100 ohms, and will drive a load impedance of 10,000 ohms or higher.
LOUDNESS AMPLIFIER
High level signals feed into the preamplifier past the input and mode switching, through
the volume control and then into the loudness amplifier. The C36 uses an active loudness
14
control circuit design. An integrated circuit operational amplifier is used with two separate
feedback circuits. One feedback loop has flat frequency response, and the other loop has
loudness compensation. A potentiometer placed between these two feedback loops makes
it possible to select any degree of frequency response from flat, to full loudness compensation. The overall gain of the loudness circuit is 20dB, which remains constant at mid frequencies, regardless of the position of the loudness control. The bass and treble compensation
increase from the reference gain, and the desired amount of loudness compensation can
be selected at any volume control setting.
TONE CONTROL AMPLIFIER
The tone control amplifier uses high technology integrated circuit operational amplifiers.
The output stages have been optimized for optimum transient performance and minimum
distortion. Another set of operational amplifiers are arranged in a circuit configuration
equivalent to series tuned circuits. The series tuned circuits can be inserted into either the
input, or the feedback loop by means of a potentiometer. The proper choice of circuit components results in a 12dB boost or cut at the desired bass and treble frequencies. When the
tone control potentiometers are at their center or detent positions, all tone control elements
are removed from the signal path, and the frequency response is perfectly flat.
15
TECHNICAL
DESCRIPTION
BLOCK
DIAGRAMS
16
BLOCK
DIAGRAMS
17
BLOCK
DIAGRAMS
18
The letters correspond to the paragraphs on pages 8, 9, 10 and 11
50/60H2
120 VOLTS
AC POWER
ON AT
ALL TIMES
AC POWER RECEPTACLES THAT WILL
TURN ON WHEN C36 IS TURNED ON
SCR 3
SWITCHING RELAY
039941
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