Yeah, I have done it. It may give a little more gain. The ticking
probably will still be there, but the effect is a bit richer. It is easy to do and is reversable.

  Use the 6G16 vibroverb schematic as a guide. Or, you can do it like a Princeton does and use the leftover troide to simulate the extra stage a reverb model Fender has. Just copy the circuit with the 3.3M resistor and 10pF cap. (This is the Mark Norwine version of the mod). Supposedly gives more gain.