Probabaly dumb question but whatever I dont know jack about tubes. What color are the tubes in your amp supposed to be when on. The one in my vibro champ (i know its not an all tube amp) has small orange light in the middle and the whole tube is gets purple. That normal, someone learn me ha.
Guild DV-4 Acoustic
Fender Standard Telecaster Ash MIM
Fender Vibro Champ XD
Yeah they're supposed to be orange in the middle because the plates insided them are getting red hot. I don't really feel like explaining how a tube works, but that's all you need to know for now.

Quote by dullsilver_mike
The resonant frequency of the clitoris is too low for the guitar players to take care of.

Quote by jackers1234
you sir, have just won for this statement. =D

Young Knees
most tube glow orange whilst some go blue i think this mostly occurs with high gain marshalls and peaveys