TomMcNally wrote:The lil Kawai has a late 60's early 70's look to it.
You might want to lay the back on a photocopier
and snag the schematic before it wears any more.
Cool !
erichayes wrote:That board looks suspiciously similar to one in an amp I restored earlier this year. Some heads-ups:
If they haven't started already, those PIO coupling caps will go leaky. There should be no DC voltage on the grid sides of the caps. If there is, replace them. I replace them whenever I find them, just to minimize the rubber-band effect.
Those funky gray resistors with the values printed on them are notorious for changing value. They can be checked in-circuit to see if they're in the ballpark. Any that aren't should have one lead disconnected and be rechecked.
If you have hum with the volume all the way down, replace the electrolytic caps.
Almost all mid-60s Japanese circuit boards had foil lifting issues, even back then. Now, with 40 years of heat literally baking them, the foil can lift with the slightest amount of mishandling. If you find any problems with the amp, and aren't absolutely comfortable doing the repairs yourself, find an experienced pro to do the work.
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