Denon 680NAB (c. 1993)
The Denon 680NAB - listed as the TU-680NAB in the period press - is an AM/FM tuner from the early Nineties. Most of what's known about it comes from a few 1993 reviews. Audio (April 1993, p.66) gave it an Equipment Profile. It noted impulse-noise reduction, manually or automatically selectable audio bandwidth, a connection for an external AM antenna, and coverage of the expanded AM band (540 to 1,700 kHz). That expanded-band capability was current for 1993, when AM broadcasters were just moving into the newly allotted frequencies.
HI-Fi-Stereo-Buyers (May 1993, p.48) also covered the tuner and discussed its pre-emphasis. The reviewer observed that the effect was negligible below about 2-3 kHz, so it wouldn't impair reception through existing receivers or tuners that didn't pass the higher frequencies. In a later issue, Audio (July 1993, p.82) suggested pairing the tuner with an LF Engineering M-601 AM antenna to see whether signal quality or the number of acceptably received signals improved.
Beyond those reviews, the record is thin. No original price, production dates, or detailed specifications have surfaced. The 680NAB appears to have been a quiet entry in Denon's tuner lineup of the period.
Known specs
- AM/FM tuner (reviewed as TU-680NAB)
- Impulse noise reduction; selectable audio bandwidth (manual or auto)
- External AM antenna connection
- Expanded AM band coverage: 540–1,700 kHz
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