Now that my KLM-367 seems fairly happy, I've turned to the KLM-366B to see what's up with the stretched tuning. Playing up an octave seems to go 13 or so semitones instead of 12. VR3 will improve this a bit if it is cranked fully clockwise, but not enough to solve the problem. VR2 doesn't do anything at all. The culprit seems to be the PC1 photocoupler. I did a quick check on the web and didn't see any except at the big parts wholesalers where there is either a $200 minimum order or minimum 1000 pieces or something like that. On Ebay all I can seem to find are transistor-output type devices, not the old style photo-resistor output like the P1501. Does anyone know where to get one of these, or what a reasonable replacement might be? Thanks, Don B.
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Replacement for HTV P1501 photocoupler?
2010-02-16 by longenough2002