Assuming you mean the.47uf cap between pin 3 of V1 and the boost switch, that cap should be fine. The voltages do not sound like the issue.
1: Confirm the speaker connection is good to the OT.
2: Confirm that you have 6.3v on both sides of V1. The tubes heat up?
3: Double check the shielded cable from the input jack (the 68k resistor if you included one)and pin 2 of V1. Only the outer shield should go to ground (and then only be grounded on one end) and that the center lead does NOT go to ground (no matter what the illustration shows).
4: Double check the input jack connections and confirm they are correct. Switchcraft jacks have different lug assignments from some other jacks.

Post some photos of the chassis.