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The
SX-525 was introduced in 1972 and manufactured through 1973. It was rated
at 17 watts per channel but this was actually quite adequate for most
listeners looking for a receiver with the SX-525's list price of just
under $240.00. It was finished win vinyl woodgrain with solid walnut
trim.
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The
SX-535 the follow-up model to the SX-525 and was introduced in 1974 and
manufactured through 1975. Output per channel was bumped up slightly
to 20 watts per channel RMS. Controls differed from the SX-525, and
all pushbuttons were now aluminum instead of plastic. It had a list
price of just under $300.
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SX-550
The
SX-550 was the all-silver successor to the SX535. It was introduced in
1976 and was produced through 1977. The analog tuning dial was silver with clear plastic face, as
other Pioneer receiver models were in the late 1970s. It was rated
at 20 watts per channel RMS. With a list price $250.00, it was a
very affordable and popular receiver in Pioneer's line. Pioneer
achieved the lower price by moving production of its lower-end receivers to the Republic
of Korea.
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SX-580
The SX-580 was introduced in 1978 and actually had a lower
price than the SX-550 with a list price of only $225.00 and was Pioneer's
entry-level receiver. The price climbed back up to $250.00 in
1979. This 500 model was still rated at 20 watts per channel.
The primary difference from the SX-550 was the change to a more readable
black signal strength meter. It was produced through 1980.
Interestingly, the SX-580 lost weight; it was the lightweight of the
Pioneer receiver line at 18.25 pounds.
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