[e-merlin]

Those are the exact questions you will find answers to if you go over to the Peavey Amp Forum. You'll need to sign up, but it's a great resource for all Peavey guitar amps. There are guys over there that play 'em stock and guys over there that have 'em modded in custom cabs. You'll find lots of tube discussion over there as well. It's not as lively a board as this one, but the search function will provide you with hours of reading, just on the C30.