VINTAGE TECHNOLOGY ARCHIVE / AUDIO / SHERWOOD / S-7800

Sherwood S-7800 (1967–1968)

A mid-sixties Sherwood receiver that keeps getting mistaken for a late-seventies amplifier. The period record is thin enough that the confusion has stuck.

Overview

The Sherwood S-7800 was a stereo receiver built on a single chassis, with AM, stereo FM, and an integrated amplifier together. That was the standard three-in-one format of the mid-1960s. High Fidelity (March 1968, p.67) confirmed the configuration when it ran the unit through its equipment reports section. The review measured the receiver at 16½ by 4½ by 14 inches. That is standard width and shallow depth for the era, not the deeper chassis that became common a few years later.

Sherwood advertised the model as the S-7800-FET. The company's campaign through 1967 leaned hard on one selling point: all-silicon construction. That was a deliberate shot at the Germanium transistors and tube Nuvistors still common in competing designs at the time. The advertised music-power rating was 100 watts at 8 ohms with 0.3% harmonic distortion. IM distortion was held to 0.1% at 10 watts or less, and power bandwidth was 12-35,000 Hz. Those are advertising figures, not independent bench numbers. They still describe a receiver positioned as a serious mid-line component rather than an entry-level box.

The S-7800 is sometimes assumed to be a late-1970s Sherwood integrated amplifier. It is not. The period documentation is unambiguous: this was a 1967-68 receiver. The confusion likely stems from Sherwood's habit of reusing and extending model numbers across product generations.

The documentation is poor. No factory manual or brochure has surfaced in the Archive, the FM capture-ratio figure is truncated in the surviving ad OCR, and the list price in the High Fidelity review copy is cut off. What survives is an advertising campaign and one equipment report. That is enough to establish identity and a partial spec sheet, and not much more.

Key Features

All-Silicon Construction

Sherwood's advertising in Audio (September 1967, p.26) and High Fidelity through 1967 made all-silicon design the headline claim, contrasted explicitly against Germanium transistors and tube Nuvistors. The pitch was reliability and consistency rather than raw performance. It is the one design claim the company repeated in every version of the ad. The surviving documentation does not say whether the silicon devices delivered the promised durability in practice.

"Instamatic" Output Overload Protection

According to the company's own advertising, the S-7800 carried Sherwood's "Instamatic" output overload protection circuitry. It was a protection stage meant to keep the output devices from destroying themselves under fault conditions. That was a useful thing to have on a solid-state receiver of the period, since output-stage failures were a real risk in designs without adequate protection.

Noise-Threshold-Gated FM Stereo/Mono Switching

The tuner section used a noise-threshold-gated automatic FM stereo/mono switch, again per Sherwood's advertising. In practice the receiver would drop to mono when the stereo pilot signal degraded past a threshold. It traded stereo separation for a quieter signal on weak stations. That was a common approach in the era, and the "noise-threshold-gated" description sets it apart from simpler pilot-detection switching.

Front-Panel Feature Set

The front panel carried an FM stereo light, a zero-center tuning meter, and an FM interchannel hush adjustment, along with a mono/stereo switch and a stereo headphone jack. Rocker switches handled tape monitor, noise filter, and main/remote speaker disconnect. The front-panel hush adjustment puts FM noise control within reach instead of burying it on the rear panel. The main/remote speaker disconnect let owners run two speaker pairs without rewiring.

Tuner Measurements

Advertised FM sensitivity was 1.6 µV (IHF) for 30 dB quieting, with an FM signal-to-noise ratio of 70 dB. On the phono side, Sherwood claimed 1.8 mV sensitivity and -70 dB hum and noise. The FM capture-ratio figure is truncated in the surviving ad copy and cannot be reported. These are manufacturer figures from an advertising campaign, so they show the design target and not verified bench performance.

Historical Context

The S-7800 sat in Sherwood's 1967 lineup and was advertised under the S-7800-FET name in Audio (September 1967, p.26) and in High Fidelity through 1967. High Fidelity (March 1968, p.67) gave it a full equipment report. That is the only independent period assessment of the model the Archive has located. Production is documented as 1967-1968.

The model number was carried forward into at least two related designations, the S-7800-FET and the S-7800A. No documentation has surfaced that explains what distinguishes them from the base S-7800. That naming overlap is almost certainly the source of the confusion between this receiver and Sherwood's later gear.

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VINTAGE TECHNOLOGY ARCHIVE / 10-14-2026 / FEEDBACK