McIntosh MC2002
Overview
The MC2002 is a Class-AB solid-state stereo power amplifier rated at 200 watts per channel into 8-ohm loads, or 300 watts per channel into 4 ohms, sustained from 20 Hz to 20,000 Hz with both channels driven. That's the minimum sine wave continuous average power rating, measured under the FTC's November 4, 1974 amplifier rule. Bridged to mono, the same chassis delivers 600 watts into an 8-ohm load, which is a useful number if you're driving a stubborn speaker.
The interesting part is what's missing. As Audio (April 1985, p.59) noted, the amplifier is somewhat lighter than former McIntosh amplifiers of this power rating because it has no potted output transformer or autoformer. Most McIntosh amplifiers lean on transformer coupling. The MC2002 goes direct, and the period press treated that as a deliberate engineering choice rather than a cost cut. Audio (April 1985, p.59) described the design goal as achieving high performance with stability and reliability through a simple topology, with selected components operating in their most linear range.
Total harmonic distortion is specified at 0.01% maximum at any power level from 250 milliwatts up to rated power, 20 Hz to 20,000 Hz, both channels running. The mono bridged figure carries the same 0.01% ceiling. Intermodulation distortion is also 0.01% maximum across any combination of frequencies in the same band. Frequency response at one watt runs +0, -0.25 dB from 20 Hz to 20,000 Hz, and opens out to +0, -3.0 dB from 10 Hz to 100,000 Hz. Hum and noise sit 100 dB below rated output. Damping factor is greater than 100, which is why owners describe the bass as tight.
Input impedance is 20,000 ohms, and input sensitivity is switchable for either 1.4 volt or 2.5 volt, so matching it to a wide range of preamps is straightforward. The rear panel also carries an attenuator switchable between 0 and -5 dB. Audio (April 1985, p.59) noted that the input signal passes through that attenuator before being a.c.-coupled to one input of a differential amplifier stage. IHF dynamic headroom is 2.1 dB at a 4-ohm load and 1.7 dB at 8 ohms. Power requirement is 120 volts, 50/60 Hz, drawing 0.6 to 15 amperes.
Design and Reception
Stereo output load impedance is 4 ohms to 8 ohms. Mono operation gets to 8 ohms by connecting across the output terminals of both channels. That's a narrower impedance window than the transformer-coupled McIntosh amps, and it's the trade-off you accept for direct coupling. If you're running 16-ohm speakers or something exotic below 4 ohms, this isn't the amp for you.
The period press was warm on the MC2002. Audio (April 1985, p.1) ran the amplifier on its cover under the headline "Long-Term Reliability, Excellent Soundstage". The service documentation that survives is thorough, running from performance specifications through a full alignment procedure, circuit operation notes, and a two-channel amplifier section broken out across multiple schematic pages.
The parts list is worth a look: 12,000 µF electrolytic capacitors at 100 volts, wirewound noninductive 0.5-ohm 5-watt resistors in the output stage, metal-film resistors at 1% tolerance scattered through the signal path, and thermal switches on the output section. The output devices sit in TO-3 sockets. They're socketed, not soldered, which makes service far less painful than it could have been.
Collectibility & Value
The MC2002 occupies an odd spot in the McIntosh collector market. It's not an autoformer amp, so it doesn't carry the same mystique as the transformer-coupled classics, and it doesn't have the tube glow that drives the real money.
Condition matters a lot here. The amplifier is old enough that electrolytic capacitors, power supply components, and oxidized connections are routine service items rather than surprises, and a "working" example isn't the same as a reliable one. Buyers should expect to budget for a technician's time on any unrestored unit. The documentation survives, the output devices are socketed, and the topology is simple enough that a competent tech won't be guessing. Original glass faceplates and correct knobs are the cosmetic items to check, since those are the parts that disappear over decades of moves and mishaps.
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