I have always wanted a Seymour Duncan Convertible amp. I don't have cash. I do, however, own a 1968 Fender Vibro Champ. It has been modded with a Mercury Magnetics 57 champ OT and has been converted to a 10 inch 4 ohm Peavey Scorpion speaker. This amp will run with a 6V6 or 5881 power tube. This amp sounds excellent.