Pioneer SX-535
This is sort of a baby pioneer, rescued from the scrap bin. It came in with a couple of bent knobs, and an amp fault which showed up later. The pot shafts were heated with a soldering iron and bent back, and the whole front given a bit of a clean.
There was a dodgy transister in the feedback circuit which varied when you touched it - so easy to identify! After a bit of detective work I put in a new pnp of suitable voltage - but with a bit less gain. This made the channel louder - so I changed the other side too. Replacing a couple of electrolytics with tantalums completed the fix - all the panel lamps were fine anyway. Funnily it sounds better than the sx-838, which is cool..
| Specifications (1974-1975)
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| Power output RMS (20Hz-20kHz) | 20WPC (8 ohm) 22WPC (4 ohm)
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| THD | 0.08-0.8%
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| Damping factor (8ohm, 1kHz) | >30
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| Tuner sens (FM) | 1.9uV, sel 60dB, s/n 70dB
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| Tuner distortion (FM) | Mono <0.2%, Stereo <0.4%
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| Weight | 22.5lb
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| Cost when new | $299
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 SX 535bw (41.6kB)
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