I have a chassis drilled for 2 inputs, 4 pots, 2x noval, and 3x octal tubes. It can fit a 12" board in it. I don't want to build another 5e3. I also have a 5f11. What other cool 6v6 power tube based circuits could I build in this thing? I've been combing through Valco and Silvertone schematics, but haven't come across anything that makes me say 'thats the one' yet. I would love a nice tremolo in there if possible. Suggestions? Filter caps would need to be mounted on the board - I don't have space for a cap-can. Looking to use what I have instead of buying a bunch of new parts for this chassis.