Does anyone have input on the sound of an 807 vs the 6L6GC ? I'm possibly looking at buying a mate to my Stancor Williamson amp, and its been modded to take a 6L6. I have one thats still fitted with the original 807 tubes. If I did get this, I'd probably be buying 4 tubes of either type but I'm looking for thoughts on which type to buy. I'm sort of leaning towards the 807 for price and the fact it has that cool plate cap, but should I really consider a 6L6GC or a KT66 or something ? http://www.pmillett.com/file_downloads/stancor_ul_schematics.pdf the second set of schematics for the amp in ultralinear mode is what I'm working with.