Rotel RX-600A (c. 1974)

Little is documented about the Rotel RX-600A outside a couple of period reviews. What the record shows: it was a stereo FM/AM receiver in a wood case, with a "speaker matrix" circuit that simulated a quadraphonic effect from ordinary two-channel material. That was a selling point in the early 1970s, when quad was still chasing mainstream acceptance.

High Fidelity (February 1974, p.51) covered the RX-600A and gave the basics: $349.95, 16¾ by 5¾ by approximately 13 inches, with a two-year warranty. The front-panel selector offered phono 1, phono 2, AM, FM, aux 1, and aux 2. On the back, phono 1 was magnetic-only, while phono 2 had separate jacks for magnetic or ceramic cartridges. A review in HiFi/Stereo Review (1974, p.50) added tuner and amplifier figures: FM usable sensitivity of 2.5 µV for 30 dB quieting, capture ratio 2.5 dB, phono input sensitivity of 2.5 mV, a mike input rated at 2.2 mV, and tape output at 200 mV. It also listed FM muting, main/remote speaker switching, and a universal power supply.

Beyond those two reviews, surviving information is thin. Production years, detailed power-output figures, and service documentation haven't turned up in the Archive's files so far. The RX-600A looks like a well-built early-1970s Rotel receiver with an unusual quad-simulation feature, and not much else is firmly on paper.