McIntosh 1900 (1971–1974)

The McIntosh 1900 is a solid-state stereo receiver produced from roughly 1971 to 1974, sitting above the earlier 1700 in the company’s lineup. It’s one of those models that collectors describe as scarce and sought-after, and it’s easy to see why — it carries the classic McIntosh black glass front panel with the illuminated logo, and it sounds as good as it looks.

Under the hood, the 1900 delivers 50 watts per channel into 8 ohms (20Hz–20kHz, both channels driven) and 60 watts into 4 ohms, with THD rated at 0.25%. The phono stage offers two inputs with adjustable load, and the front panel includes a microphone jack — a period touch that dates it nicely. The tuner section was a point of pride: FM sensitivity was rated at 2.2µV, with 45dB stereo separation at 1kHz and 0.3% FM distortion. The unit also includes an AM tuner.

One detail worth noting: the tone control section is described in the service manual as an equalizer-type system with a tone defeat switch — not a simple bass/treble arrangement. The design also includes a regulated DC power supply with sensing circuitry and thermal protection.

Surviving documentation is thinner than you’d expect for a McIntosh product of this era. No original price appears in any source, and the weight figures disagree depending on where you look (45 lbs per hifi-classic.net versus 24 kg per vintage-amp.net). The single-source claim that this was McIntosh’s first solid-state receiver seems questionable given the 1971 introduction date, so treat that with skepticism. What’s well-corroborated: the 50W/8Ω output, the 0.25% THD, the 75dB signal-to-noise ratio, the 1971 introduction, and those classic McIntosh looks. The 1900 has provisions for an optional moving coil head amp, which adds to its flexibility for vintage turntable setups.

Audio (June 1976, p.72) measured the related MAC-1900 and found distortion reaching only 0.13% at rated output — well below the 0.2% nominal rating — noting McIntosh could have specified the power bandwidth from 16Hz to 28kHz had they pushed their published specs as far as other manufacturers did.

Type: Solid-state AM/FM stereo receiver
Power: 50 W/ch (8Ω), 60 W/ch (4Ω)
THD: 0.25%
FM sensitivity: 2.2µV
Dimensions: 16″ W × 15.25″ D × 5.75″ H
Weight: ~45 lbs (one source lists 24 kg)