Denon TU-680NAB

Little is documented about the Denon TU-680NAB beyond its appearance in the audio press in early 1993. It was an AM/FM tuner, and the surviving reviews suggest a model with unusual attention paid to AM reception.

Audio (April 1993, p.66) logged impulse-noise reduction, manually or automatically selectable audio bandwidth, a connection for an external AM antenna, and coverage of the expanded AM band up to 1,700 kHz. In the same issue (p.70), the magazine measured harmonic distortion, excluding the noise component, at just under 1 percent on a 1-kHz signal. It called the TU-680NAB a happy exception to the generally poor sound of most AM tuner sections. A later Audio column (July 1993, p.82) tried it with an LF Engineering M-601 outboard AM antenna to see whether signal quality improved. HI-Fi-Stereo-Buyers (May 1993, p.48) confirmed the AM/FM designation and noted the tuner's pre-emphasis had negligible effect below 2-3 kHz.

Beyond those reviews, almost nothing else is recorded — no production years, original price, or full specification sheet has surfaced. The surviving picture is of a 1993 Denon tuner that took AM seriously.

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