Specifications

• Signal Processor input and output for both LISTEN
and RECORD circuits
External signal processors can be connected to
modify the program when recording or when listen-
ing.
• Low Frequency and High Frequency Filters
The low frequency (LF) filter attenuates the. pro-
gram material at 12 dB per octave below, 50 Hz to
help eliminate rumble, acoustic feedback and
other similar unwanted noises. Above 7,000 Hz the
high frequency (HF) filter attenuates hiss, scratch
and such unwanted noise at 12 dB per octave.
• Active Loudness Control
Loudness controls typically are simple, passive cir-
cuits connected to a portion of the rotation range
of the volume control. As a consequence, loudness
compensation accuracy is dependent on many
variables such as speaker efficiency, amplifier
gain and differences in input level. The C 33 loud-
ness control is continuously variable, operates in-
dependently of the volume control, and its contour
is accurately modeled after the Fletcher Munson
family of "Equal Loudness" curves.
• Front Panel Tape Jacks
A fourth tape deck may be plugged into the front
panel without disturbing your permanently wired
system.
• High Accuracy Tracking Volume Control
The volume control is a step attenuator which has
tracking accuracy within 1 dB throughout its entire
range. Such extremely accurate matching is ach-
ieved through electronically controlled trimming of
the resistance material deposited on pairs of print-
ed circuits. Tracking accuracy and quiet perfor-
mance are permanently maintained. Use does not
affect performance as in ordinary volume controls.
• Automatic Power Turn On/Turn Off
Power to the entire stereo system can be controll-
ed from either the front panel power switch or the
turntable's power switch. A current sensing relay
connected to the turntable AC power outlets is
controlled by the turntable power switch. The relay,
in turn controls the AC power to the remainder of
the system. Sensitivity of the circuit is adjustable
to match the current consumption of your turn-
table.
• Two, new, quiet phono preamplifier circuits
Two turntables can be used simultaneously, listen
to one while recording from the other. New, third
generation IC OP amps are used. Because they
have lower noise and distortion than discrete de-
vices, the C 33 is the quietest phono preamp ever.
• Double shielded phono preamp
Superior performance, even in the presence of
strong interference fields, is assured by the use of
the steel exterior chassis plus an inner shield en-
closure of plated steel.
• Triple Shielded Power Transformer
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 equip-
ment. This expensive construction removes limita-
tions on how or where you may install your equip-
ment.
• Electronically Regulated Power Supplies
Maintains stable operation even during periods of
low line voltage.
• Power turn on/off Transient Protected
Power turn on and off are electronically time con-
trolled to prevent any thumps, pops or clicks.
• Switched AC Outlets
AC outlets for tape decks, tuners, etc. that turn ON
and OFF with your preamp.
• Auto Muting
To prevent any annoying pops or clicks the main
output is automatically muted when switching.
• Program Output Switching
Rear panel jacks are provided to connect two addi-
tional power amplifiers for feeding program mater-
ial to remote areas. Front panel pushbuttons will
turn the program on or off to the remote amplifiers.
Alternately, the pushbuttons can control remote
speaker systems when used with an accessory
switching relay (the Mclntosh SCR 2).
• LED Function Indicators
Long life solid state indicators show the system
status.
• Unique Flexible Mode Switch
Can be used in seven modes of operation.
• Monitor Amplifier
A wide band, very low distortion 20 watts per chan-
nel power amplifier feeds the front panel Head-
phone jacks, the 600 ohm line outputs and monitor
outputs. Complete protection is assured by the
Mclntosh developed and patented POWER GUARD
and Sentry Monitor circuit. You can listen in private
to headphones with the main power amplifier turn-
ed off, use the Monitor Output to feed remote loud-
speakers or in association with audio time delay
devices and other applications.
• Full Monitor Amplifier Input Flexibility
Input to the Monitor Amplifier can be selected from
three inputs: the LISTEN circuit, the RECORD cir-
cuit, or the external input jacks on rear panel.
• Dual Headphone Jacks
Two pairs of headphones may be powered from the
internal monitor amplifier.
• Modular Construction
Should service be required, it can be done quickly
and easily.
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