Twin Reverb '65 Reissue Reverb Effect Not Working

[TwinJunior]

Help please! My reverb channel doesn't seem to be working properly. I can hear the reverb responding when i tap on the tank but it's not affecting the guitar signal, even with the reverb turned up to 10. Any ideas?

[Enzo]

The control only affects the return part, which is working to make that crash noise. SO you have lost the drive. Unplug and then reinsert the RCA plug into the INPUT jack on the reverb pan.

With the RCA plug unplugged, measure resistance across the empty RCA jack on the INPUT jack of the pan. You should see a low resistance. If it is open, then the pan is defective. In that case you MIGHT simply have a broken little green or black wire inside the pan, which is repairable. Also reseat the plugs on the reverb cables on the rear panel of the amp chassis.

The cord that plugs into the INPUT on the pan? If you connect that to a small speaker, you should be able to hear the signal. If not, then your circuit inside is faulty.

[The Dude]

I like to do an initial check of the pan by checking resistance on the amp side of the RCA cables. You are then checking cables and tank at the same time and you don't need to take the tank out of the bag or remove it from the amp to test. Only if I get infinite resistance on one of those measurements do I remove the tank to see if it's tank or cable.