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Started by mhutcherson, February 14, 2022, 11:20:17 AM
Quote from: theseacowexists on February 19, 2022, 07:56:40 AMYessir. Check the resistors and the diodes in the power supply too, to make sure that none of them are shorted or too far out of spec. If you don't have 200V at point B, there is not enough voltage for the pickup to produce any sound - just like a wurly.
Quote from: theseacowexists on April 11, 2023, 01:59:14 PM140V should be enough voltage to power the pickup. My Pianet gets about that much at the pickup and it works fine.Are you measuring 140V on the pickup itself, or just at the power supply? It could be that the voltage is not making it from the power supply to the pickup due to a broken wire or bad connection.Is the pickup shorted to the reeds at all? In that case there would be no voltage at all on the harp, and therefore no sound. Check for continuity between the pickups and the reed. If there is continuity, then they are shorted somewhere.If that is all well and good, then we should check the preamp, since you've confirmed that the power amp "PU" preamp work. Can you insert a signal at the junction of C1 and R2?