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Try changing the pre-amp tubes one at a time starting from the one farthest away from the power tubes.

It sounds like a pre-amp tube failure to me..
 

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Tarl said:
Thanks Scottone...it was a pre amp tube. I replaced the 4 JJs with the original GTs that came in it and it worked like a charm. Did not have the time to do 1 at a time. My first tube failure in over 30 years of playing!
Glad it worked out for you.

When you have the time, swap the JJ's into the first position one at a time until you find the dud.
 
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