The appearance of a
McIntosh speaks
eloquently of precision,
quality, premier
performance and long,
trouble-free life. Consider the
construction and materials used in
the front panel and knobs. Each
constituent part is selected for
long, wear-resistant life and stable
attractive styling. The panel itself
is select white flint glass, free from
bubbles, flow marks and other
faults. It is silk screened on the
reverse side with thermal setting
epoxy screen inks which
practically become a part of the
glass. Then it is built into a
brightly polished and anodized
frame. The knobs used are
meticuously machined of solid
aluminum then anodized and
thermally isolated.
Convenience and ease of
operation support the
concept of human
engineering when the AC
power switching
versatility is considered. The AC
power to the entire stereo system
may be controlled from either the
turntable's power switch or the
power switch on this exceptional
preamplifier. Connected to a
special power outlet is a current
sensing relay
that
will
be
energized
when the turntable is turned on or
when the red power switch is
pushed on the C 33. The relay, in
turn, controls the AC power to the
rest of the stereo system.
Sensitivity of the circuit is
adjustable to match the current
consumption of your turntable.
You can install your C 33
anywhere. A solid copper
band, a silicon steel band
and a mild steel outer
casing confines the
magnetic field of the power
transformer to reduce the
potential for hum pickup in either
the C 33 or associated equipment.
This time proven yet expensive
construction bypasses the
destructive heat and other
associated problems found in
alternate, less satisfactory
methods of transformer
construction. The McIntosh
transformer design and
construction gives you a very
worthwhile benefit by removing
any limitations on how or where
you may install your equipment.
A wide band, very low
distortion 20 watts per
channel power amplifier
feeds power to
headphones. The power
amplifier is a complete, fully
designed amplifier. Music listening
is protected by the patented* *
POWER GUARD circuit and circuit
components are protected by the
patented* * Sentry Monitor circuit.
The listen and record selector
switches are mounted on the front
panel sub chassis. Input selection
for each preamplifier originates here
by switching dc on these contacts.
The Power Guard waveform
comparison circuit detects
waveform differences between the
input and the output signal. A
sampling of the program material
at the output of the amplifier is
constantly compared with the
program material at the amplifier
input. Should the differences reach
1%, Power Guard goes to work. In
only a fraction of a millisecond
Power Guard dynamically reduces
input level to prevent amplifier
overload yet permits the amplifier
to deliver its absolute maximum
power output without extra
distortion. The operation of the
Power Guard circuit is absolutely
silent. There is not even "soft"
clipping. There is simply no
clipping!
The Sentry Monitoring circuit
constantly monitors the output
signal. At signal levels up to rated
output this circuit has no effect. If
the power output exceeds design
maximum, or in the event of a
short circuit or severe mismatch,
the Sentry Monitoring circuit will
protect the output transistors from
failure.
* High Fidelity July 1982
** McIntosh research, engineering
and design for the McIntosh C 33
Control Center has developed circuits
covered by these U.S. Patents:
4,065,682; 4,048,573; 3,526,847;
and 3,526,846.
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