Fisher 750 (1971–1973)
The Fisher 750 is a quadraphonic receiver from the early 1970s, built while the four-channel format war was in full swing. A period advertisement in Audio (July 1972, p.19) used an automotive analogy to argue for matching components correctly. The receiver handles both conventional two-channel stereo and the newer matrixed quad sound. It has a built-in SQ decoder for the CBS/Sony-developed matrix format, so SQ-encoded records play through four speakers without an outboard adapter.
The specs show the dual personality. In plain stereo mode, the 750 delivers 35 watts RMS per channel into 8 ohms. In four-channel operation that drops to 25 watts per channel, for a total of 100 watts RMS across all four channels. Frequency response is rated at 20Hz-20kHz, with THD listed at 0.5% (the source doesn't say whether that figure applies to stereo, quad, or both). The FM tuner is respectable for the era, with 1.8 µV IHF sensitivity and 40 dB stereo separation. Phono input sensitivity is 2.5 mV, and the unit draws 170 watts.
It's a big, heavy box: 20 inches wide, 5-7/8 inches tall, 14-1/2 inches deep, and 34 pounds. The original price was $449.95, which put it in the serious-hobbyist bracket of the quad era.
That's about all the record holds. The spec sheet is complete, but there's no documented user experience, no service history, and no surviving commentary on how it actually sounded or held up over time. If you own one, you're holding a piece of the quadraphonic moment that's thin on paper but solid on paper — the specs suggest a well-built receiver that could do double duty as a stereo workhorse or a four-channel centerpiece.
- 2-channel mode: 35W RMS/ch into 8Ω
- 4-channel mode: 25W RMS/ch into 8Ω (100W total)
- Built-in SQ decoder
- FM sensitivity: 1.8 µV (IHF); stereo separation: 40 dB
- Dimensions: 20" W × 5-7/8" H × 14-1/2" D; 34 lbs
- Original price: $449.95
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