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• 12:45, 4 October 2024 Peter talk contribs created page PG505/Repairs (Created page with "==Power supply== A PG505 that was described by a seller as "no variable frequency" showed an erratic output signal that partly responded to output voltage and rise/fall time controls, but was essentially at mains frequency. The source of the problem was a dry electrolytic (C555) in the floating power supply. Because the floating output stage is transformer-coupled, the output pulse was effectively triggered by the pulsed supply. The electrolytics are physically large a...")