Lack of Power on Channel 1 - troubleshooting advice?

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JD1965

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Hi Folks,

Something weird has been going on with my 'clean' channel. It seems to have lost a lot of volume recently. Channels 2 and 3 seem as beefy as always.

Your thoughts on things I could check out?

Can preamp tubes for channel 1 have an impact of volume if gone bad?

And which ones are they?

Any help appreciated,
JD
 
I would check v1 and v3 preamp tubes first. V3b is solely for ch1 so could be a dud half of a tube causing your issue.
 

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