Hi,
I changed the power tubes in a friend's amp and when testing it I noticed that the clean channel starts squealing on higher Gain, Master, Presence and Treble settings (if one any of them is higher set). I didn't play the amp before changing the power tubes but I don't think that's the problem.
The other thing I noticed is when I switch the Standby OFF I get a loud pop again when clean channel is active. When ch 2 and 3 are active the pop is insignificant but on the clean channel is loud.
I tried different first two preamp tubes but the problem persists. No similar problem on ch 2 and 3.
I would appreciate any ideas or comments.
I changed the power tubes in a friend's amp and when testing it I noticed that the clean channel starts squealing on higher Gain, Master, Presence and Treble settings (if one any of them is higher set). I didn't play the amp before changing the power tubes but I don't think that's the problem.
The other thing I noticed is when I switch the Standby OFF I get a loud pop again when clean channel is active. When ch 2 and 3 are active the pop is insignificant but on the clean channel is loud.
I tried different first two preamp tubes but the problem persists. No similar problem on ch 2 and 3.
I would appreciate any ideas or comments.
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