I have Lucky 7. It is my go-to tone. I also have BJ 21. The only thing better would be to double the power amp tubes. Which, in fact, I can with the Black Jack 21. 6V6s sounds thin, light and brittle. I feel that the Amp can do more oomph!! Has anyone ever swapped with EL-34s and re biased with decent results? Am I able to rebias with little knowledge?? I just LOVE EL 34s in that circuit. LOVE. Or can I just run it with EL-34s for a minute or two without doing damage without rebiasing? Mr. Andy is 30 min East on Rt 80 from me. I'll gladly find an excuse to visit shop if I have to.