Sherwood 7800-FET (circa 1967)
What survives of the Sherwood 7800-FET record is essentially the company's own 1967 advertising campaign. No independent lab test or editorial review has surfaced in the Archive's files. Sherwood ran a feature-and-spec spread for the "S-7800-FET" in the US audio monthlies from spring through autumn of 1967. The version in Audio (May 1967, p.24) and a nearly identical ad in High Fidelity (October 1967, p.168) describe a solid-state FM stereo receiver, with tuner and amplifier specifications presented together.
Sherwood's copy stressed an all-silicon design and a protection circuit it called "Instamatic" for output overload. It also listed noise-threshold-gated automatic FM stereo/mono switching, a zero-center tuning meter, an FM stereo light, and a front-panel interchannel hush adjustment. Other front-panel conveniences were a mono/stereo switch, a stereo headphone jack, and rocker switches for tape monitor, noise filter, and main/remote speaker disconnect. The amplifier section was claimed at 140 watts music power into 4 ohms at 0.6% harmonic distortion, IM distortion of 0.1% at 10 watts or less, and power bandwidth of 12-35,000 cps. Phono sensitivity was rated at 1.8 mV with hum and noise of -70 dB. On the FM side, IHF sensitivity was claimed at 1.8 µV for 30 dB quieting, and FM signal-to-noise at 70 dB.
Beyond the ads, the record is thin. No original price, production dates, dimensions, or service literature have surfaced. How the 7800-FET relates to the S-7800 and S-7800A in Sherwood's catalog is not documented. It may have been a short-run variant, or it may simply have escaped the usual paper trail. Sherwood was actively promoting it during 1967.
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