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McIntosh C22

Stereo tube pre-amplifier

 

Vintage version

FRONT PANEL : glass at top, anodized gold at bottom.

Top line (from left to right) : Balance, Input selector with indicator lights: aux, tape, tuner 2, tuner 1, phono 1, phono 2, mic and tape hd. Mode selector with indicator lights: L to L+R, R to L+R, stereo rev, stereo, mono (L+R), L+R to L and L+R to R. Volume.

Lower line (from left to right): Bass controls: left and right, Rocker switches: comp (RIAA or LP), tape (normal or monitor), power (on/off), left tape jack, tape jacks switch (record and playback), right tape jack. Rocker switches : rumble (flat or filter), hf (flat or filter), loudness (normal or compensated).  Treble controls: left and right.

  Commemorative Edition  Frank H. McIntosh

(Reissue)

FRONT PANEL:  glass at top, anodized gold/silver at bottom.

Top line : Balance. Input selector : tape 2,tape 1, CD, tuner, phono 1,phono 2, aux 1,aux 2. Mode selector: L to L+R, R to L+R, stereo rev, stereo, mono (L+R), L+R to L and L+R to R. Volume.

Lower line : Bass controls: left and right. Tape 1 and tape 2 switches (normal or monitor). Left tape jack. Speakers selector: off, 1, 2, 1+2. Right tape jack. Rumble and hf switches (flat or filter). Loudness switch (normal or compensated).Treble controls: left and right.   

 

C22 top panel

Tape equalisation: left and right. Low frequency trim : left and right . Output level:   left, left+ right, right. Phase switch (reverse 180° or 0°). Pilot lamp intensity (dim or bright).

 

C22 Commemorative Edition top panel

Schematics and specifications.

 

 

C22 back panel

AC outlets : 4 (black ) switched and 1 (red) unswitched. 600 w total. Fusing. Speakers connection (from power amp and to speakers). Ground. Outputs: L+ R, Main, Tape. High level inputs: tape monitor, aux, tape, tuner 1, tuner 2. Low level inputs: phono 1, phono 2, mic, tape head. Tube cabinet (six tubes).

 

C22 Reissue back panel

 

AC outlets : 4 switched and 1 unswitched (1400 w total). Balanced outputs: left and right. SCR socket. Outputs : 1 and 2 (switched) – main – tape 2 – tape 1. High level inputs: aux 1, tape 2, tape 1, CD, tuner. Low level inputs: phono 1, phono 2. Tube cabinet (seven tubes).

 

 C22  top open view

 

C22 Reissue top open view

 

C22 bottom view

 

                    C22 Reissue bottom view

 

                              SPECIFICATIONS

 

C22

 

Frequency Response 20-20kHz (+0.5 -0.5dB).

Distortion 0.02%.

Noise and hum -85dB high level.

 

Rated Output 2.5v, 10v max.

Total Harmonic Distortion:

Less than 0.2% at 10 volts output.

Less than .02% at 3 volts output.

 

Input sensitivity and impedance:

aux 0.25V at 250k,

phono 2mV at 47k.

tape head 2 mV, 1 MΩ

Center channel out (L+R) 1.0v with control.

 

Individual tone controls:

bass and treble +20dB to -20dB.

Rumble filter 50Hz at 12dB/octave.

HF filter 5kHz at 12dB/octave.

Low frequency trim controls:

6dB of boost below 100Hz.

Voltage gain

Phono 1/ Phono 2 to tape 42 dB at 1000 Hz

Phono 1/ Phono 2 to Main  62 db at 1000 Hz

High level to tape: 0 dB

High level to main: 20 dB.

Mic to main:  60 db

Mic to tape 40 db

Tape Head (at 500 Hz):

To Main Output, 62 db

To Tape Output, 42 db

Tubes: (6)12AX7. Solid state rectifier bridge.

Power consumption : 34 w 

C 22 Commemorative Edition

 

Frequency Response 20-20kHz (+0 -0.5dB).

Distortion 0.02% IHF.

Noise and hum: -90dBa high level,

-80dB  10mV phono.

Rated Output 2.5v (at main), 8V max.

Total Harmonic Distortion:

0.02% maximum IHF

0.02% max from 20 Hz to 20 kHz at rated output

 

Input sensitivity and impedance:

high level 0.25V at 22k,

phono 2.2mV at 47k and 65pF.

 

 

 

Individual tone controls:

bass and treble +20dB to -20dB.

Rumble filter 50Hz at 12dB/octave.

HF filter 5kHz at 12dB/octave.

 

 

Voltage gain

Phono to tape:41 dB at 1000 Hz

Phono to main: 61 dB at 1000 Hz

High level to tape: 0 dB

High level to main: 20 dB.

 

 

 

 

 

Tubes: (3)12AT7, (4)12AX7. Solid state rectifier

Power consumption : 37 w 

DIMENSIONS

C22

 

16” wide (front panel)  by 13” depth by  5” high

Weight 16 lbs.

 

 

C 22 Commemorative Edition

 

16” ( 40.6 cm) wide by 14” (35.6 cm) depth – 5-7/16 high

Weight 18 lbs. ( 8,2 Kg) 

 

Are available on request the owner’s and the service manuals for both units.

 

 

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