Aiwa AD-6800 (circa 1978)

The Aiwa AD-6800 was a three-head cassette deck sold in the late 1970s. It sat just below the flagship AD-6900U in Aiwa’s line. High-Fidelity (December 1977, p.12) called it Aiwa’s “newest response” in cassette deck design. The magazine pointed to the Flat Response Tuning System (FRTS), a built-in 400 Hz and 8 kHz test oscillator. The deck used it to measure and set the precise bias for any cassette tape on the market, whether LH, FeCr, or CrO₂. The three heads allowed off-tape monitoring during recording. The same source noted a double-needle meter that combined VU and peak level readings on a single scale, plus a Peak Hold button to capture transient peaks. Wow and flutter was rated at an extraordinarily low 0.05%.

The deck also had automatic front loading. Insert a cassette and it draws the tape into the mechanism. High-Fidelity (September 1978, p.61) ran an advertisement calling the AD-6800 a “full deck” of features, and it again played up the FRTS system and the three-head configuration. Past these period ads and a brief promotional mention, little else is documented. No original price, production years, or detailed test bench results have been confirmed from independent reviews. The AD-6800 appears to have been a short-lived model, contemporary with the AD-6900U and aimed at the serious home recordist who wanted bias adjustment without an external test instrument.

Type: Three-head cassette deck, front-loading
Heads: 3 (erase, record, playback)
Bias adjustment: Flat Response Tuning System (FRTS) with built-in 400 Hz and 8 kHz test oscillator
Metering: Dual-needle combination VU/peak meter with Peak Hold
AUTO LOAD: Yes (cassette draws into mechanism)
Wow & flutter: 0.05% (period claim)
Reported in period ads (1977–1978); no confirmed specs for frequency response, S/N ratio, or dimensions