Heathkit AA-1800
The Heathkit AA-1800 is one of the more elusive entries in the company's audio catalog. The record gives a set of solid, consistent specifications and almost nothing else. No production years, no original price, no owner reviews, no service notes. It's a power amplifier that exists in the archives mostly as a spec sheet.
What is clear is that the AA-1800 was a serious, high-power amplifier: 125 watts RMS per channel into 8 ohms, and 250 watts RMS per channel into 4 ohms. Multiple independent databases confirm those figures. It was rated for 0.02% THD at rated power, with a frequency response of 5 Hz to 100 kHz (+0, -3 dB), a damping factor above 100, and a signal-to-noise ratio of 100 dB (IHF-A). Input sensitivity was 1V into 47kΩ. These are genuinely competitive numbers for the era, and they would have placed it among the more muscular solid-state amplifiers of the early 1980s. The unit appeared in period audio publications, including Audio magazine's annual index in December 1982 (Audio, December 1982, p.89).
One detail sets the AA-1800 apart. It was described as a "modular" design, with both preamp and power amp sections housed in a single chassis. That's an unusual setup for a unit often listed simply as a power amplifier. It suggests the AA-1800 may have been a flexible, system-oriented component, possibly with swappable or separable modules. No documentation survives to explain exactly how the preamp and power sections were connected or configured.
The physical record is thin and contradictory. One source lists the AA-1800 at roughly 19 x 6.8 x 10.8 inches and 55 pounds. Another gives significantly different dimensions, so even the size of this unit is uncertain.
- Power output: 125W RMS/ch into 8Ω; 250W RMS/ch into 4Ω
- Frequency response: 5 Hz – 100 kHz (+0, -3 dB)
- THD: 0.02% at rated power
- Damping factor: >100
- S/N ratio: 100 dB (IHF-A)
- Input sensitivity: 1V into 47kΩ
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