Heathkit AJ-43
Not much is documented about the Heathkit AJ-43 beyond period announcement ads and tuner-survey listings. Those agree with each other, though. It was Heathkit's deluxe all-transistor AM-FM stereo tuner kit, introduced in 1963.
Heathkit's own announcement in Audio (August 1963, p.49) called it an "all-transistor, all-mode" tuner. It came out alongside the matching AA-21 70-watt all-transistor amplifier as the company's "Deluxe Transistor Twosome" - HiFI-Stereo (November 1963, p.67) ran the introduction, and High Fidelity (January 1964, p.93) carried Heathkit's ad for the pair. The ad promised cool, hum-free operation, freedom from microphonics, and fast transient response.
The 1964 tuner-survey tables give the hard numbers. Audio (May 1964, p.57) listed the AJ-43 as a 25-transistor kit with 2.5 µV IHF sensitivity, ±1 dB response, automatic stereo, and a $119.95 price. HiFI-Stereo (September 1964, p.115) carried the same specifications in its own cost comparison.
Known specs:
- Kit — AM-FM stereo tuner
- 25 transistors
- IHF sensitivity: 2.5 µV
- Frequency response: ±1 dB
- Automatic stereo switching
- Original price: $119.95
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