ADC 606 (c. 1966–1967)
Little is documented about the ADC 606, and most of what survives is its own advertising. The 606 was a solid-state FM stereo receiver, advertised at 90 watts, and promoted as a new model alongside the company's earlier Model 600. An ADC ad in High Fidelity (November 1966, p.24) reminded readers that the 600 - $219, 60 watts, solid state - had set the trend in low-cost quality receivers. The same ad described the 606 as designed for people who listen critically. A later ad in Audio (October 1967, p.79) called the 606 top-rated and invited readers to take one home for a live demonstration.
No manual, spec sheet, or independent magazine review of the 606 has surfaced in the Archive. Output into specific loads, FM sensitivity, circuit details, and the exact production span are all undocumented. The ads bracket the model to roughly 1966 through 1967. If you own period literature on the 606, the Archive could use it.
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