So this is Tubenit's one-tube reverb circuit as a drop-in for an amp. I tried to make the board as small as I could. Could y'all take a look and give some constructive criticism. This is really for conversational purposes. This is the circuit below. I went ahead and made space for the plate voltage resistor that may or may not be necessary. I also used Hoffman's templates for the caps and resistors so they ought to be to scale. The tank and the transformer are just standard Fender values and since I don't know what amp this would go to I don't know what plate voltages to use, and so that's going to affect everything else. This is the 12DW7 tube, which is a cool little dual triode tube that has the gain factor of a 12ax7 on Number 1 triode and the current handling capacity of a 12au7 on the Number 2 triode. So the 12au7 would feed the driver stage and the 12ax7 would feed the recovery stage.