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Pioneer
introduced the SX-626 in 1972. It featured 27 watts per channel RMS,
ten watts per channel more than the SX-525 that was also introduced that
year. The list price was $279.95. It was offered again in
1973, but inflation hit the stereo component market, and the price rose to
$329.95.
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The
SX-636 was introduced in 1974 and manufactured through 1975. It was rated
at 25 watts per channel. Pioneer cut the THD by 50% with the SX-636
compared to the SX-626. The intermodulation distortion was also cut
in half. The tuner sensitivity and capture ration was also improved
with this model. It's list price was just under $350.00. |
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SX-650 
The
SX-650 the follow-up model to the SX-636. It was introduced in 1976 and
manufactured through 1977. It was distiguished by the silver AM/FM
analog tuner dial that was the mark of Pioneer receivers in the
"50" series. Pioneer was able to keep the
price at $300, having a more than adequate 35 watts per channel,
RMS. |
SX-680
The SX-680 was changed little
from the SX-650, with the most notable difference being the switch to
black meter faces to increase legibility. Pioneer did this to all
the "80" models in its receiver line in the late 1970s.
The SX-680 was introduced for 1978 and was manufactured through
1980. There were dramatic improvements in all the key specifications
over the SX-650, and this was achieved with a lower list price of $275.00
when introduced, but price rose to $300 for 1979 and 1980. This was
the last year of the traditional Pioneer receiver with analog tuning and
knobs, switches and pushbuttons. The age of the microprocessor would
make its appearance with the SX-6 in 1981.
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