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Really nice pair of Heathkit AA-14s with the famed 51-29 output transformer. These little amps sound awesome, and they have been fully recapped with quality components like CE can caps and PIO caps. I did mod these into basic power amps with a volume control. Sort of like the UA-1/2. Vintage RCA preamp tubes and Sylvania black plate el84s in one and Japanese el84 in the other, plus Mullard ez81 rectifiers. 14+ wpc of el84 goodness!EL84 tubes are marched for current and transconductance.
At US$800, this asking price is a strong deal for a verified pair of Heathkit AA-14 monoblocks, as the median for a single unit typically sits around US$150–US$200, making this pair’s price far below the 75th percentile for matched sets. The listing matches a recent US$800 sale for a similarly described pair, confirming this is a fair market value for a clean, original-owner pair with the famed 51-29 output transformers.
These little solid-state amps are well-regarded for their crisp, loud sound in typical living rooms, delivering 15 IHF watts per channel with excellent damping and wide frequency response. Their compact size, rare 1960s monoblock configuration, and inclusion of the high-quality output transformer make them a worthwhile buy for enthusiasts seeking vintage tone without the bulk of tube gear. With no noted failure points or missing accessories, this is a genuine buying opportunity, not a warning.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Heathkit traces its origins to 1911 in the United States, when Edward Bayard Heath founded an aircraft company in Chicago after acquiring the Bates Aeroplane Co. Renamed E.B. Heath Aerial Vehicle Co., it pioneered kit-built planes like the 1926 Heath Parasol. Following Heath's death in a 1931 test flight, Howard Anthony acquired the bankrupt firm in 1935, shifting focus to aircraft accessories in Benton Harbor, Michigan. Post-World War II, Anthony pivoted to electronics in 1947 with surplus parts, launching the iconic O-1 oscilloscope kit for $50—a bestseller that birthed the Heathkit brand and its DIY ethos.
In hi-fi audio, Heathkit earned acclaim for tunable amplifiers, integrated receivers, preamplifiers, tuners, and speaker systems, all sold as meticulous assembly kits from the 1950s through the 1970s. Standouts included the AA-151 and A-7E power amps, known for their robust tube and solid-state designs, alongside full stereo systems like the AR-15 receiver. The brand expanded into test gear and amateur radio but prioritized high-fidelity components for home enthusiasts.
Heathkit occupied a mid-tier market niche, delivering exceptional value through user-assembled kits that rivaled factory-built rivals at half the cost. Prized for reliability, customization, and warm sound signatures, these vintage pieces command collector status today among audiophiles restoring "kit-built" icons. Though production ceased in the 1980s after Zenith's acquisition, Heathkit's legacy endures as a cornerstone of DIY hi-fi heritage.
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