In Reply to: RE: Dynaco Pas Hum posted by Rudes on May 28, 2020 at 11:32:03:
"Heater wires to board...11v AC to ground. 22v DC across." That's the hum you are hearing. Do you have a schematic for the PS board? If not, just follow the wires back, it should take you to one or two diodes and one or two electrolytics. Your problem should be right there. If you have any electrolytics around that are sufficient voltage, you can jump them across the existing electrolytics see if voltages correct and hum stops.
A thought, 120V or 240? Any chance transformer primary is wired for 120 and you are someplace with 240VAC?
I accept e-mails if you get stuck.
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- RE: Dynaco Pas Hum - fredtr 05/28/2011:43:15 05/28/20 (40)
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- RE: Dynaco Pas Hum - fredtr 16:18:38 05/29/20 (19)
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- RE: Dynaco Pas Hum - fredtr 21:20:47 05/29/20 (15)
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- RE: Dynaco Pas Hum - fredtr 07:06:36 05/30/20 (13)
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- RE: Dynaco Pas Hum - fredtr 09:49:31 05/31/20 (10)
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- RE: Dynaco Pas Hum - fredtr 10:52:04 05/31/20 (8)
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- RE: Dynaco Pas Hum - Rudes 04:27:09 06/1/20 (5)
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- RE: Dynaco Pas Hum - tubular.well 15:44:26 06/11/20 (0)
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- RE: Dynaco Pas Hum - fredtr 08:06:24 06/1/20 (0)
- RE: Dynaco Pas Hum - Rudes 08:20:05 05/30/20 (0)
- RE: Dynaco Pas Hum - mark.korda@myfairpoint.net 13:28:26 05/29/20 (2)
- RE: Dynaco Pas Hum - mark.korda@myfairpoint.net 13:33:06 05/29/20 (1)
- RE: Dynaco Pas Hum - fredtr 13:54:17 05/29/20 (0)
- RE: Dynaco Pas Hum - Rudes 14:13:55 05/28/20 (3)
- RE: Dynaco Pas Hum - airtime 16:32:15 05/28/20 (0)
- RE: Dynaco Pas Hum - fredtr 16:16:51 05/28/20 (0)
- RE: Dynaco Pas Hum - airtime 15:32:11 05/28/20 (0)
- RE: Dynaco Pas Hum - fredtr 13:13:54 05/28/20 (0)