Wow, I thought I already posted this one. Guess not...
I have a Peavey Classic 30 with Sovteks in it, and a Sheffield speaker (I tinker). And a 515 head with Sovteks through a 4x12 Laney with Celestions, and a custom 2x12 with 1 sheffield, and one blue marvel (the on eout of the classic 30!).
I'm eventually going to change all the capacitors in both amps to orange-drops to smooth out the sound (de-fizz).
God bless.