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the input preamplifier used to amplify and
equalize signals from phonograph pickups,
microphones or tape heads. Skillful circuit
layout, proper grounding, and adequate
shielding reduce the hum so low it is virtually
unmeasurable. Extreme care in manufactur-
ing combined with low noise tubes, high
specific resistivity circuit boards, metal film
and wire wound resistors achieves new low in
residual noise.
The second amplifier section follows the
main volume control, making it impossible to
overload the high level input circuits or any
following circuits. The same design tech-
niques as used in the preamplifier section
assure low noise and hum. The BASS and
TREBLE feedback-type tone controls operate
in connection with this amplifier section. The
controls are switch-type with approximately
4 db change per step. Exceedingly low distor-
tion and precise control of frequency re-
sponse contours are assured using this
arrangement.
Front panel tape jacks are provided for
convenient use of an external tape machine.
The TAPE JACK switch connects the jacks for
either playback or recording through the C22.
The third section is the cathode follower
output. The sharp cutoff (18 db per octave)
RUMBLE and HF (high frequency) filters are
associated with this section. OUTPUT LEVEL
controls are located at the inputs of the cath-
ode followers to allow simple balance of the
entire amplifier-speaker system. The OUT-
PUT LEVEL controls are located on top of the
C22, behind the front panel. These controls
are conveniently accessible by releasing the
PANLOC buttons and sliding the C22 out to
the adjust position.
The power supply deserves special men-
tion. The power transformer is constructed
with "core" type grain oriented laminations
and magnetic shielding for low external hum-
fields. Long life rectifiers with full wave
rectification, filter condenser sectionalizing
and careful grounding add to the hum-free
long life characteristics of the C22.
Special attention has been given to the
mechanical design. The PANLOC system is
the first professional installation technique
to be used on stereo instruments. The
PANLOC system gives you absolute ease of
installation, operation and maintenance. The
C22 may be conveniently installed in furni-
ture cabinets, custom-built installations, pro-
fessional relay racks or an attractive finished
Mclntosh cabinet.
MECHANICAL SPECIFICATIONS
Size:
Front panel; 16 inches wide by 5
7
/
16
inches
high; chassis (including PANLOC shelf) 15
inches wide by 5 inches high by 13 inches
deep, including connectors; clearance in
front of mounting panel including knobs,
1½ inches.
Weight:
16 pounds net, 25 pounds in shipping carton.
Finish:
Anodized gold and black (front panel).
ELECTRICAL SPECIFICATIONS
Power Requirement:
117 volts 50/60 cps AC, 34 watts.
Input Sensitivity and Impedance:
Auxiliary, Tape, Tuner 1, and Tuner 2: 0.25
volts, 250,000 ohms.
Phono 1 and Phono 2: 2 millivolts, 47,000
ohms.
Microphone: 2.5 millivolts, 1 megohm.
Tape Head: 2 millivolts, 1 megohm.
Tape Compare: 0.25 volts, 250,000 ohms.
Frequency Response:
±0.5 db from 20 cps to 20,000 cps.
Distortion:
Less than 0.2% at 10 volts output.
Less than .02% at 3 volts output.
Total Noise:
High Level Inputs: 85 db below rated output.
Low Level Inputs: Less than 1.5 microvolts at
input terminals.
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