70s fender amp reverb not working


70s fender amp reverb not working. 

It it is not the reverb tank, or the 12AT7 tubes (reverb drivers)
leemurray2007
If you have to guess if the power tubes are bad, just get new power tubes and go from there.
@hotei yeah, I need new power tubes. Now there is no output at all. But i didnt know that 6L6GCs were that expensive.