McIntosh C33 Specifications download pdf (Page 4)

Introduction

The Mclntosh C 33 is a super quality, high perfor-

mance Stereo Preamplifier. Its design has been

governed by insistence on great flexibility, versatili-

ty, low distortion and high performance with long

life.

The C 33 provides many features for your listening

enjoyment. They include:

1. a dual preamplifier system with separate listen

and record program lines, which allows listening

to one program source while recording from a dif-

ferent independent program source.

2. a low noise electronic input switching system,

which uses dual field effect transistors (FETs) and

short signal leads to give great source to source

isolation, low distortion, and freedom from noise

and hum pickup.

3. two, seven source, input selector switches for 3

tape decks, 2 turntables, 1 tuner, and 1 auxiliary,

which allow independent source selection for

listening and recording.

4. an electronic record monitor switch, which

allows the record program line to be heard

through the main listen output.

5. a five band program equalizer, which permits

the adjustment and improvement of the loudness

contrast of the five most important frequency

ranges. Each band can be emphasized or de-

emphasized to satisfy your listening taste. The

program equalizer can be switched to either the

listen or record program lines. This allows

equalizing the record output signal to tape

recorders or equalizing the main listening output.

6. a precision volume control, which is electroni-

cally trimmed during manufacture to maintain

channel to channel accuracy to better than 1

decibel (dB). This high order of accuracy assures

continuing program balance as the listening

volume is changed.

7. an active circuit loudness control, which is

electrically independent of the volume control.

Close conformity to the Fletcher-Munson equal

loudness curves can be attained regardless of the

volume control position.

8. high and low frequency filters, which reduce

high frequency noise and low frequency rumble at

a 12 dB per octave roll off rate.

9. a compandor, which permits expansion or com-

pression of the dynamic range of program mater-

ial from either the record tape output or the main

listen output. Compressed recordings and broad-

casts can be expanded on playback to restore

their dynamic range. Tapes can be recorded using

compression and replayed using expansion to in-

crease signal-to-noise ratio.

10. front panel tape recorder jacks, which allow

simple plug-in of an additional tape recorder

without disconnecting your regular system. This

makes tape copying to a portable recorder very

convenient.

11. a tape recording program line, which makes it

very easy to record phono, tuner, or auxiliary on

up to 3 recorders at the same time (4 recorders

when using the front panel tape recorder jacks) or

to copy from recorder to recorder. Recording

operations do not interfere with the separate

listen program line.

12. an automatic AC power control circuit, which

can conveniently turn off the entire stereo system

when the turntable turns off.

13. a built-in monitor amplifier, which provides 20

watts per channel power output and includes the

Mclntosh patented Power Guard protection cir-

cuit. The monitor amplifier can be operated from

the listen program line, the record program line, or

independently from a separate external source.

14. two front panel headphone jacks, which are

15. two speaker output pushbuttons, which control

the operation of two sets of loudspeakers (when

used with the optional SCR-2 speaker control

relay) or two sets of power amplifiers.

16. electronically regulated power supplies, which

maintain stable operation even during periods of

low line voltage.

This outstanding preamplifier will serve you best

when you understand its functions and what it is de-

signed to do. Some time invested with this manual

will be valuable in your knowledge of how it works.

The simplified block diagram on page 3 shows how

the C 33's internal circuits are arranged. The simpli-

fied connecting diagram on page 6 shows how other

components are connected to the C 33.

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McIntosh C33 Specifications Page 4

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