Aiwa AD-6900U (ca. 1978–1979)
Documentation on the Aiwa AD-6900U is thin. What survives comes almost entirely from a short advertising campaign that ran across several audio magazines in late 1978 and early 1979. The ads were headlined "The Unreel Deck." They positioned the AD-6900U as a cassette deck whose specs and sound quality could challenge a good reel-to-reel machine, which was a bold claim at the time.
The ads appeared in Audio (October 1978, p.50) and High Fidelity (March 1979, p.10). They list a handful of features. The deck had built-in 400 Hz and 8 kHz oscillators for making test recordings, so the user could check tape performance before committing to a live recording. It also had Aiwa's exclusive Synchro-Record function, which coordinated recording with the companion AP-2200 turntable. The High Fidelity ad also mentions a "Flat Response Tuning System (FRTS)," but the surviving copy doesn't explain how that circuit works.
Beyond these ads, no service manual, spec sheet, or contemporary review has turned up in the Archive's research. Original price, dimensions, transport type, and detailed performance figures are unrecorded in the available sources.
- Model: Aiwa AD-6900U (cassette deck)
- Year: ca. 1978–1979 (based on magazine ad dates)
- Known features: Built-in 400 Hz / 8 kHz test oscillators, Synchro-Record, Flat Response Tuning System (FRTS)
- Advertised alongside: Aiwa AP-2200 turntable
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