Tweaker 40 not working

Plainview

New member
I have a Tweaker 40 head that stopped working. The power tubs glow. The preamp tubes heat up. It works when I plug into the effects loop return but not when I plug into the front. I replaced the preamp tubes.

Any ideas on what to try next? I've not worked on an amp before but I'm adept with a multimeter.

I tried to write a question on the Egnater service page, but I get an error from the Egnater website when I'm trying to submit the ticket.

Thanks.
 
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