Introduction
Why the C 30 costs more but its VALUE TRIPLES
other preamplifiers.
The Mclntosh C 30 is a superb quality, high perfor-
mance stereo preamplifier. Its design has been
governed by insistence on great flexibility, versatili-
ty and high performance with long life.
This outstanding preamplifier will serve you best
when you understand its functions and what it is
designed to do. Some time invested with this
manual will be valuable in obtaining the most from
your C 30.
The C 30 provides many features for your listening
enjoyment. They include:
1. High level inputs to accommodate the traditional
as well as all the latest audio sources such as com-
pact disc players and the high quality audio from
video recorders and laser video disc players.
2. A specially designed low noise switching
system operates the inputs, the mode circuits and
the tape monitor circuit. This system uses a pair of
cascaded field effect transistors (FET). The input
connecting leads are now very short, one twentieth
(1/20} of their previous length. The advantages of this
arrangement includes, source to source isolation,
lower distortion, and freedom from hum, noise and
high power TV and radar signals.
3. Any one of seven input sources can be selected
using electronic switching. The seven input sources
are turntable, tuner, compact disc player, laser video
disc player, television audio, video tape recorder and
one auxiliary.
4. Electronic tape monitor switches for two tape
recorders allow either tape recorder to be heard from
the main output.
5. A five band program equalizer permits the ad-
justment and improvement of the loudness contrast
of the five most important frequency ranges.
Musical balance of source material can be adjusted
to compensate for room recording differences or
listener preferences.
6. A precision main output volume control is elec-
tronically 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 listening volume is changed.
7. A precision headphone-line output volume con-
trol allows headphone-line volume to be adjusted in-
dependently of the main volume. The construction
and performance of this control is identical to the
main volume control.
8. An active circuit loudness control is electrically
independent of the volume control. Close conformi-
ty to the Fletcher-Munson equal loudness curves
can be attained regardless of the main volume con-
trol position.
9. A band pass filter switch reduces high frequen-
cy noise and low frequency rumble at a 12dB per oc-
tave roll off rate.
10. Front panel tape recorder jacks allow simple
plug-in of an additional tape recorder without
disconnecting your regular system. This makes
playback from or copying to a portable recorder very
convenient.
11. An automatic AC power control circuit can
conveniently turn off the entire stereo system when
the turntable turns off.
12. A built-in headphone amplifier, with two front
panel jacks, powers two pairs of dynamic head-
phones.
13. Two speaker output pushbuttons control the
operation of two sets of loudspeakers (when used
with the optional SCR-2 speaker control relay) or two
sets of power amplifiers connected to the rear panel
1 or 2 output jacks.
14. Electronically regulated power supplies main-
tain stable operation even during periods of low or
changing line voltage.
15. Rear panel switching signal processing jacks
for both tape out and main out. A noise reduction
unit or other signal processing device can be con-
nected to each section.
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