Excellent 1977 McIntosh C32 Dual Stereo Preamplifier and Audio Control Center-Serviced

PRIVATE STOCK FROM MY PERSONAL COLLECTION!!!

Here for your consideration is an Excellent 1977 McIntosh C32 Dual Stereo Preamplifier and Audio Control Center that has been recently serviced and looks and plays great.

This 16” x 14” x 5.5” C32 stands out as a "dual stereo" system because it features completely independent "Listen" and "Record" program lines. This unique topology allows you to listen to one audio source (like a turntable) while simultaneously routing an entirely different source (like a tuner or auxiliary input) to a tape deck for recording.

I took it to my Tech Friend Don last month and he tested it out, repaired a faulty solder connection at Main Out, repaired both “monitor Amp” sub controls, repaired a faulty connection at the “expander” switch, cleaned all the controls and switches, and detailed the front panel and knobs.

The only slight negative I would mention is the top and sides of the cabinet show age, but the front panel is excellent!

Check out the incredible specifications below.

Surely about the finest Preamplifiers money can buy!

Key Specifications

·         Frequency Response: 20 Hz to 20 kHz (+0, -0.5 dB); 10 Hz to 100 kHz (+0, -0.5 dB) with equalizer off

·         Total Harmonic Distortion (THD): 0.05% or less across rated output (20 Hz to 20 kHz)

·         Input Sensitivity & Impedance:

o    Phono (1 & 2): 2 mV at 47 kΩ (65 pF)

o    Aux, Tuner, Tape (1, 2, 3): 250 mV at 50 kΩ

·         Signal-to-Noise Ratio (Hum and Noise):

o    Aux / Line: 100 dB (IHF), 90 dB (without acoustic compensation)

o    Phono: 90 dB (IHF), 80 dB (without auditory sense correction)

·         Voltage Gain: 62 dB (MM Phono), 20 dB (Line/Aux)

·         Outputs:

o    Main output: 2.5V into 5 kΩ

o    Tape output: 0.25V into 5 kΩ

o    Monitor / Headphone / Line output: 12W + 12W continuous into 8 ohms (20 Hz to 20 kHz, 0.1% distortion)

·         Tone & Program Equalizer: Built-in 5-band program equalizer (30 Hz, 150 Hz, 500 Hz, 1500 Hz, and 10000 Hz with ±12 dB boost or cut)

·         Filters: Low-Frequency (LF) filter at 50 Hz (-12 dB/octave); High-Frequency (HF) filter at 7 kHz (-12 dB/octave)

·         Power Requirements: 120V at 85 Watts

·         Dimensions & Weight: 16" wide × 5.4" high × 13" deep behind panel (approx. 406 × 138 × 330 mm); Weight: 26 to 27 lbs (11.8 to 12.2 kg)

·         Internal Build: 67 transistors, 35 ICs, 62 diodes, 2 FETs, and 1 SCR

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From AI on the NET:

The McIntosh C32 is a vintage dual solid-state stereo preamplifier produced from 1977 to 1982 with an original MSRP of around $1,649 to $1,659. You can find a comprehensive breakdown of the unit on HiFi Engine and technical specifications via the Audio Database McIntosh C32 Page.

The McIntosh C32 is a vintage, solid-state dual stereo preamplifier and audio control center introduced by McIntosh Laboratory in the late 1970s (around 1977–1979). Revered by vintage hi-fi collectors for its signature backlit glass faceplate and warm analog sound, the C32 is highly regarded for its robust construction and incredibly flexible control features.

On the market, pre-owned and professionally serviced units generally command a price range between $1,599 and $3,200 depending heavily on cosmetic condition, operational servicing, and the inclusion of original packaging or the classic L-52A slanted-leg walnut cabinet.

Key Features & Specifications

The C32 stands out as a "dual stereo" system because it features completely independent "Listen" and "Record" program lines. This unique topology allows you to listen to one audio source (like a turntable) while simultaneously routing an entirely different source (like a tuner or auxiliary input) to a tape deck for recording.

·         Built-in Monitor Amplifier: Unlike standard preamps, the C32 includes an internal 12W + 12W (at 8 ohms) power amplifier designed to power secondary monitor speakers or high-impedance electrostatic headphones.

·         5-Band Program Equalizer: Rather than basic bass and treble dials, it incorporates active rotary equalizer controls centered at 30 Hz, 150 Hz, 500 Hz, 1,500 Hz, and 10,000 Hz with a ±12 dB boost/cut range.

·         Exceptional Connectivity: It features dual phono inputs (input sensitivity of 2mV), three separate tape loops with advanced tape-copy switching, and a high-quality variable loudness control.

·         Technical Performance: Delivers a flat frequency response of 20 Hz to 20,000 Hz (+0, -0.5 dB) with a total harmonic distortion factor restricted to 0.05% or less at rated output.

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