McIntosh MC2100 (1969-1978)
2-channel solid state power amplifier with Autoformer output and tube-style design, produced from 1969 to 1978.
Overview
Manufactured by McIntosh Laboratory, Inc., the MC2100 is a 2-channel solid state power amplifier introduced in 1969 as part of the company's first series of solid state amplifiers. It was designed using technology and design principles derived from their earlier tube amplifiers, resulting in a unit that delivers a warm, robust sound often described as the most "tube-like" among McIntosh's solid state offerings. The amplifier features the classic McIntosh aesthetic, resembling the look of vintage tube models like the MC240 and MC275.
Specifications
| Year of Production | 1969 - 1978 |
| Power Output | 105 Watts per channel (stereo, 8Ω), 210 Watts (mono) |
| Frequency Response | 20 Hz - 20 kHz (+0 – 0.25 dB) |
| Total Harmonic Distortion | 0.25% or less |
| Signal to Noise Ratio | 90 dB |
| Input Sensitivity | 0.5V |
| Input Impedance | 200kΩ |
| Output Impedance (Stereo) | 4Ω, 8Ω, 16Ω |
| Output Impedance (Mono) | 2Ω, 4Ω, 8Ω |
| Damping Factor | 11 |
| Dimensions | 7-3/4" H x 11-3/4" W x 17" D |
| Weight | 57 lbs |
| Key Features | McIntosh Autoformer, Sentry Monitor protection, solid state design |
Design
The MC2100 uses a solid state design with patented McIntosh Autoformers on the output, allowing for optimal power delivery across different speaker impedances. It includes Sentry Monitor circuitry to protect against output faults. The unit incorporates power supply filter capacitors, RCA input jacks, and volume controls, and maintains the iconic front-panel appearance of McIntosh tube amplifiers.
Market
Originally priced at $599, the MC2100 has seen rising market interest, with units reported purchased for $600 as recently as 2014. Common issues include failing power supply filter capacitors, worn RCA jacks, degraded volume controls, and damaged output barrier strips. Preventative maintenance often involves replacing electrolytic capacitors on input and driver boards, after which measured distortion can drop to 0.1–0.2%.
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