may have found the problem...

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In Reply to: Plate Voltage balance of Triode 6dj8 tubes UPDATE. posted by Cougar on April 14, 2013 at 10:31:17:

I started doing resistance checks again and notices that the area where the that 200k resistor (the one that was mearsuring 210k)and 100 ohm resistor attached to the Source lead of the Mosfet in the bad left channel was measuring 2.1 meg to ground. The good channel was measuring around 200k to ground. snipped the Source lead of the Mosfet in the bad channel and measurement immediately went to 200k, did the other mosfet too which was measuring close to 200k and now has the same measurement of 200k. I must have damaged the Mosfet in the left channel when I was either changing it or was damaged due to the original 200k resistor being out of tolerance. Hopefully this will be the cause of that hum.

I will post back the results in a few days.

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Follow Ups Full Thread

Topic - Plate Voltage balance of Triode 6dj8 tubes UPDATE. - Cougar 10:31:17 04/14/13 (9)

Counterpoint SA-1000 hum. I give up! It wins! - Cougar 19:52:48 04/16/13 (4)

RE: Counterpoint SA-1000 hum. I give up! It wins! - wheezer 11:48:40 04/20/13 (1)

RE: Counterpoint SA-1000 hum. I give up! It wins! - Cougar 03:19:00 04/21/13 (0)

RE: Counterpoint SA-1000 hum. I give up! It wins! - Michael Samra 21:25:39 04/16/13 (1)

I sent you an email. - Cougar 16:00:59 04/17/13 (0)

Sure it's a 60Hz hum? - FenderLover 17:00:24 04/14/13 (0)

may have found the problem... - Cougar 13:56:55 04/14/13 (0)

RE: Plate Voltage balance of Triode 6dj8 tubes UPDATE. - Palustris 11:50:28 04/14/13 (1)

RE: Plate Voltage balance of Triode 6dj8 tubes UPDATE. - Cougar 12:08:49 04/14/13 (0)

Follow Ups

may have found the problem... - Cougar 13:56:55 04/14/13 (0)

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