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In Reply to: RE: I monitored the bias voltage over time posted by DAK on January 12, 2017 at 02:25:27
When I read the other answers you gave in this thread, I realized that it could not be the things I mentioned, because both sides (left and right) behave the same.
So it has to be something different.
Then I read your answer that the bias transformers gets hot
And that should not happen.
So I would replace the transformer.
Follow Ups:
Hi AD, i have 2 tx in the circuit, the filament trans and the choke. The filament tx gets warm and hot at about 30 minutes of use (i noticed the heat during the first few times i powered up the amp and now i notice that it gets warm after about 5 minutes) the choke is cool. My feeling is i should try a different fil trans.
AD has a point. As the transformer heats up the DCR is drifting. Perhaps check your connections first as you said it was fine in the shop.
That the bias transformer heats up can be a problem of the transformer, but could also bet hat one of the capacitors in the bias supply is not good (internal leak) so the bias transformers has to deliver some current.
Edits: 01/12/17
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