This hasn't been touched on too much regarding this amp, so figured I'd make a definitive thread on it. But basically, just wondering who here has done some tube swaps with these heads, and what are the results you got. Figure we could share our collective experiences here. For example, right now, I've got the stock tubes still in my V2, but I'm looking to put some fresh ones in, and thinking I might as well explore my options. I thinking I'd like something a little 'sharper' sounding than the stock ECC83S's. Little more aggressive bite, and thick, but controlled low end. Granted this amp already has these characteristics, so maybe it's a matter of what best compliments the tone towards that end? Also...the 12AT7 in the power stage....I'm thinking something a bit more "raw" and throaty sounding if possibly. What would do for that?