Have a BF Fender Vibrolux Reverb. The reverb is not working and I have been troubleshooting through the logical "if ... then" possibilities. It is not the pan or the connecters, the footswitch, or the V3 or V4 tube. Having ruled out the obvious, I next am going to check for continuity on the reverb transformer. If nothing is wrong there I then will do a visual inspection of the reverb circuit to look for a charred resistor, exploded cap, broken wire, etc. Looking for input if you have had experience with this type of thing. I am not an amp tech, but have read quite a bit about the working of the tube amplifier and have done some minor troubleshooting/repair of my own amps. I have several Fender BFs and want to begin to service and maintain them a bit myself.