MCS 3233 (late 1970s-early 1980s)

A solid-state AM/FM stereo receiver from Modular Component Systems, with 33 watts per channel and Motorola 2N3055 output transistors.

Overview

The MCS 3233 is an AM/FM stereo receiver made by Modular Component Systems in the late 1970s and into the early 1980s. Sales are confirmed as early as 1979. JC Penney and other retailers sold it, and it went by names including "Modular Component Systems MCS 3233" and "MCS 3233 AM/FM Stereo Receiver." It puts out 33 watts per channel into 8 ohms, both channels driven. Frequency response is 20 to 20,000 Hz, THD is 0.8%, IM distortion is 0.1%, and signal-to-noise ratio is 80 dB. It has a phono stage and solid-state circuitry.

Specifications

Product type	AM/FM Stereo Receiver
Power output	33 watts per channel into 8 ohms, both channels driven
Frequency response	20-20,000 Hz
THD	0.8%
IM distortion	0.1%
Signal-to-noise ratio	80 dB
Phono stage	Present
Tuning bands	FM, MW
Output transistors	Two Motorola 2N3055 output transistors

Design

The MCS 3233 uses two Motorola 2N3055 output transistors, which are known for durability and are easy to replace. The knobs are milled aluminum. The dial lamps give off a warm glow while the unit runs.

Context

The MCS 3233 was sold through department stores such as JC Penney in 1979. It shares a schematic with the MCS 3235, though the 3235 runs on higher voltage DC.

Market

Units have turned up in thrift stores for as little as $5 - $10. Units in good condition list for around $160. Replacement parts, including the original volume knob, are available on eBay. One known issue is a bent tuner rod. The output transistors may fail over time, but they are readily available.