Aiwa AX-7800U (ca. 1980)

Little is documented about the Aiwa 7800U, which period sources list as the Aiwa AX-7800U. What survives comes almost entirely from a handful of magazine references in 1979 and 1980. It was an AM/FM stereo receiver. HI-Fi-Stereo-Buyers (May 1980, p.50) listed it at $590 with a continuous power rating of 60 watts per channel into 8 ohms, 20-20 kHz, at no more than 0.05% THD. The same source noted that the unit used synthesized digital tuning, then a relatively new feature in the mid-price receiver market.

The June 1980 issue of HiFI-Stereo carried a full test report by Hirsch-Houck Laboratories (p.42-46). Their measurements showed the amplifier section delivered its rated power cleanly. The tuner's frequency response was flat within ±0.5 dB from 30 Hz past 10 kHz, rising about 1 dB at 15 kHz. The tuner's indicator lights (nine in all) came on at inputs from 19 to 57 dBf, stereo suppression reached -63 dB, and tuner hum measured -66 dB. The review called the synthesized tuning system convenient, accurate, and effective. It was typical of the digital-frequency-synthesis receivers of the era, but executed well (HiFI-Stereo, June 1980, p.46).

Beyond these test reports, almost nothing else is recorded about the AX-7800U. No service manual, user manual, or advertising campaign has surfaced in the usual archives.

Type: AM/FM stereo receiver with digital frequency synthesis
Power output: 60 W/ch RMS into 8 ohms, 20–20 kHz, ≤0.05% THD
Price (1980): $590
Tuner features: digital synthesized tuning, scan/hold
Period publications: HI-Fi-Stereo-Buyers (May 1980, p.50); HiFI-Stereo (June 1980, p.42–46)