yahmaha j-55 reverb problem

[tytech]

reverb not working at all. Any ideas on how to diagnose this problem would be greatly appreciated. I have no schematics for this amp.

[52 Bill]

reverb not working at all. Any ideas on how to diagnose this problem would be greatly appreciated. I have no schematics for this amp.

90% of all reverb problems are usually tank related. Check the tank connections, the wires, the transducers, etc.

If you shake the tank (amp) with the reverb control turned up do you hear the springs through the speaker? If you do, you know that the tank output and the amp's recovery circuit is ok and you can limit your troubleshooting to the drive side.

Does this amp have a tank in the bottom of the cabinet, or is it one of those small chassis mounted units?