#1
So I have a few amps that I'm in the process of repairing, and wanted to get some wisdom from a few fellow gear nerds.

First problem: Sovtek Mig 100 

No volume, power surges. So I retubed the whole thing, both pre and power, and still no good through any input or on any channel. After plugging in to test, the powertubes glowed brighter (likely a higher current draw?), and it still doesn't work.

My thought is that it's something downstream from the power tubes, but I don't know what yet. 

Second problem: Epiphone Blues Custom 30
Low volume, blew a fuse. I retubed the power section, and tried to see if it was a preamp tube. The fuse stays good now, but still low volume and constant low frequency hum.

I'll probably retube the whole preamp section, but I don't know if that's the problem.

Third problem: Epiphone So-Cal 50
No power, blown fuse.  I haven't gotten into this one yet, but my guess is that a simple power tube refresh will fix it.

Any thoughts on the subject? I've got other things that I'm fixing, too, so hopefully I can get all of these things to work over time.
#2
It could be bad filter caps causing the issue with the epi and sovtek.  Also, have you tried rebiasing the power tubes after you replaced them?
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Last edited by CorduroyEW at Jun 2, 2017,