In Reply to: RE: Dynaco Pas Hum posted by Rudes on May 29, 2020 at 12:28:22:
I like unusual problems. I hope you aren't getting too frustrated with this:
"pin 4 10 AC 95 DC" - This is weird, did you mean 9.5VDC? I suggest you re-measure this. If you are still seeing unexpected voltages measure pin 5 the same way. You should get about the same ACV, but the DCV should be 10 - 12VDC different than pin 4. The polarity doesn't matter. Either pin can have the higher DC voltage.
"pin 4 to 9 0 AC 0 DC Left channel" - This is also weird. 0 volts AC is fine, 0 volts DC is not, it should be between 5 - 6VDC. If you measure again and get the same thing. Swap that tube and try it again.
"pin 4 to 9 0 AC 5 DC Right channel" this is correct/what it should be
"pin 5 to 9 0 AC 5.3 DC" this is correct/what it should be
"pin 2 to ground 0 AC" and "pin 7 to ground 0 AC" These are fine. The hum isn't coming in through the grids and being amplified by the tube.
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Follow Ups
- RE: Dynaco Pas Hum - fredtr 05/29/2012:51:51 05/29/20 (26)
- RE: Dynaco Pas Hum - Rudes 14:29:46 05/29/20 (22)
- RE: Dynaco Pas Hum - fredtr 14:58:18 05/29/20 (21)
- RE: Dynaco Pas Hum - Rudes 16:03:23 05/29/20 (20)
- RE: Dynaco Pas Hum - fredtr 16:18:38 05/29/20 (19)
- RE: Dynaco Pas Hum - Rudes 16:46:46 05/29/20 (18)
- RE: Dynaco Pas Hum - fredtr 16:58:28 05/29/20 (17)
- RE: Dynaco Pas Hum - Rudes 17:44:52 05/29/20 (16)
- RE: Dynaco Pas Hum - fredtr 21:20:47 05/29/20 (15)
- RE: Dynaco Pas Hum - Rudes 05:08:41 05/30/20 (14)
- RE: Dynaco Pas Hum - fredtr 07:06:36 05/30/20 (13)
- RE: Dynaco Pas Hum - Rudes 13:32:54 05/30/20 (11)
- RE: Dynaco Pas Hum - fredtr 09:49:31 05/31/20 (10)
- RE: Dynaco Pas Hum - Rudes 10:33:20 05/31/20 (9)
- RE: Dynaco Pas Hum - fredtr 10:52:04 05/31/20 (8)
- RE: Dynaco Pas Hum - Rudes 12:11:08 05/31/20 (7)
- RE: Dynaco Pas Hum - fredtr 13:18:58 05/31/20 (6)
- RE: Dynaco Pas Hum - Rudes 04:27:09 06/1/20 (5)
- RE: Dynaco Pas Hum - fredtr 07:26:46 06/1/20 (4)
- RE: Dynaco Pas Hum - Rudes 07:58:38 06/1/20 (3)
- RE: Dynaco Pas Hum - tubular.well 15:44:26 06/11/20 (0)
- RE: Dynaco Pas Hum - fredtr 09:52:55 06/1/20 (0)
- 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)