#1
I have just aquired a new Epiphone Valve jr. stack and have read all the mod pages I can find. I have not read of anyone using NOS tubes in one. I have alot of NOS RCA 12ax7s, and 6bq5's. I figured that the plate voltages might be too high for the NOS tubes. But I said F%^% it and tried it anyway. It sounds like a completly different amp. Sounds awesome, Almost like my 5E3 humped a Vox. but I'm wondering if I am doing any damage? Or can change something out to compensate?
#2
No you should be fine. I have only run NOS Mullards in my valve Jr for years and it continues to sound fantastic.
#3
Its the new production tubes that cant handle the high voltages.

Vacum tube production quality has dropped like a rock since the 70s (or around there). I would feel much safer running a NOS in my amp than some new production tubes from China.
#4
yeah, it's the plate voltages i'd be worried about with NOS tubes. there's a mod you can do, it's over on sewatt.com

beware, there are lethal voltages in tube amps etc. etc., if you don't know what you're doing, don't try to mod it.
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