I recently had the same problem with a new set of New Sensor Gold Lion Repro KT77's.Pretty bad when a new quad which was supposed to be re-checked before going to a customer..Ended up being a bad tube( no Bias at all ). Sent them back and went back to SED El34 tubes.
Tube amp stopped working
I have canary CA 160 mono amps. I replaced the tubes and one channel stopped working. I replaced the stock EL34 out put tubes with Gold Lion KT77. The one channel sounds better. The second channel does not play at all. All the tubes including the input tubes light up. I don't see a fuse on these. Have I missed something? Thanks
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