Heathkit AA-111 (c. 1961–63)
The Heathkit AA-111 is a stereo tube power amplifier rated at 14 watts per channel. It was sold as a kit and designed to pair with the Heathkit AA-11 or AA-141 stereo preamplifiers, though it will work with any preamp. The 1961-62 and 1963 Heathkit catalogs both list it, so it was on the market across those years.
The documented design is fairly specific. It uses Heath’s patented ULTRA-LINEAR® output circuit, with four EL84/6BQ5 output tubes and a 7199 front-end tube - seven tubes total. Power response is rated ±1 dB from 30 cps to 15 kc at 14 watts per channel. The output terminals take 4, 8, and 16 ohm speakers, and two 117-volt AC receptacles are provided for accessory equipment. The Heathkit Virtual Museum notes the neat circuit layout for easy assembly. A period catalog blurb calls the ULTRA-LINEAR® circuit the key to its performance.
One quirk is useful to owners. The AA-111 is essentially identical to the Heathkit AA-30, and the two differ only cosmetically. If you need a manual or schematic, order the AA-30 documentation. Collectors on Audio Asylum confirm this.
No production years, original price, or full frequency-response data are documented beyond what's listed above. No period reviews of the AA-111 have surfaced in the archive. What exists on its sound quality is general Heathkit tube-era reputation, not an assessment of this model.
Known Specifications
- Type: Stereo tube power amplifier (kit)
- Power output: 14 watts per channel (28 watts total)
- Power response: ±1 dB, 30 cps to 15 kc at 14 watts/channel
- Outputs: 4, 8, 16 ohm speaker terminals
- Accessory outlets: Two 117V AC receptacles
- Tube complement: Four EL84/6BQ5 output, one 7199 front-end, seven tubes total
- Circuit: Heath patented ULTRA-LINEAR®
- Companion units: AA-11 or AA-141 stereo preamplifiers
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