Heathkit AA-1640-A
Little is documented about the Heathkit AA-1640-A under this exact designation. The "A" suffix version of the AA-1640 does not appear in the period literature that survives in the Archive's collection, and no specifications, dates, or prices for this specific variant have been verified.
The base model was a significant piece of Heathkit's 1970s lineup. High Fidelity (September 1975, p.37) covered the AA-1640 as a "Super-Amp" kit - a stereo basic/power amplifier measuring 19 inches wide, 7¼ inches high, and 18 inches deep, weighing 69 lbs. It listed at $439.95 without output meters, $489.95 with them, or $69.95 for the meters alone as a later add-on. HiFI-Stereo (March 1977, p.99) described it as one powerful stereo amplifier. It cited 200 watts minimum RMS per channel into 8 ohms with less than 0.1% total harmonic distortion from 20-20,000 Hz. It also cited a quasi-complementary output configuration, 12 pounds of diecast heat-sinking, a 25-pound power supply transformer, dissipation limiting, automatic thermal shutdown, and output compensation for stability with any load.
Whether the AA-1640-A is a revision, a variant, or a cataloging quirk is not documented in available sources. If you own one, or have a manual or schematic that clarifies the "A" designation, the Archive would welcome the correction.
Known specifications for the base AA-1640 (not confirmed for the "A" variant):
- 200W RMS per channel into 8 ohms, 20–20,000 Hz, <0.1% THD
- 19" W × 7¼" H × 18" D; 69 lbs
- Kit form only; optional meters ($69.95 add-on)
- $439.95 without meters; $489.95 with meters (1975)
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