Quote:
Originally Posted by callaway
Did it work with the 6JE8? That has a much different pinout from a 12a_7 tube. I think you could have blown your power transformer. I'd pull the tubes and check to see if the power transformer measures open. If not, then leave the tubes out and check that you're getting rail voltage. Then put your original known-good tubes in and check to make sure the plate voltages are correct.
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Quote:
Originally Posted by JCMNelson
The lamp comes on, the valves heat up, but there's absolutely no sound at all! Tried different cables, with and without guitar, but nothing, apart from a pop when the amp is switched off (everytime)!
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A fully cooked PT won't work at all. If it was loaded enough to blow the fuse should go first. Still, it's easy to check. No voltage on Pin 8 of the rectifier would be a bad sign.
If the HV secondary is open the amp shouldn't pop when switched off standby.