I am wondering if anyone shares the same problem with their princeton amps, i bought an 80's model princeton 112 plus i have been using it with a digitech processor for about 6 months now, but a few weeks ago i did not have my processor so i tryed using the reverb thats built into the amp...... it didn't work.. so i took it over to let a guy, who knows more about it, look at it.. we took the amp apart.. all the wires seemed to hooked up corectly.. when the spring box was loose we could get the signal if we tapped on the springs, but when the box was attached or when we tryed to get the signal by playing my guitar... no reverb would be there... does any one know how to fix this?