Rotel RA-610 (circa 1970–1972)
The RA-610 is a stereo integrated amplifier from Roland Electronics of Japan, sold in the U.S. by Rolecor of America. It was a moderate-power model from Rotel's early export years. Period reviews suggest it was taken seriously as a good-value component in its day.
High Fidelity (July 1972, p.36) measured the power amplifier section at about 25 watts per channel at 0.1% THD. That was enough, the reviewer noted, for a pair of low-efficiency speakers in an average room. The review gave dimensions of 16 by 5 by 8¾ inches and a list price of $179. The rear panel had spring-clip speaker terminals, a thumbscrew ground connection, and a pair of unshielded metal jumpers. Pull the jumpers out and you could insert an external unit, such as a room equalizer or quadraphonic decoder, into the signal path. A 50 Hz square-wave response was also noted in the lab results.
By late 1971, the amp was being demonstrated in London alongside the Cambridge Audio P.50, P.100, and J. E. Sugden A2I/II at a comparator installation (Studio Sound, November 1971, p.14).
Little else is documented about the RA-610 beyond these few period references. No service manual, schematic, or detailed specification sheet is known to survive in the usual collector archives.
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