Tech did a re-cap plus JJ tubes, took out the hum control and blackfaced it for balance. Reverb has been weak for some time but works. He said the circuit etc is OK so it seems the tank has gone south. It works but not like it did 20 years ago. Not the original reverb tank - was a Hammond tank from Canada but had to replace it with an Accutronics way back. Was never the same after that but was OK for many years. Also tremolo stopped working after he did the bias. He replaced the opto-whatever, no change so put back the original. I read somewhere that hot bias will stop the tremolo. I don't use it anyways but would like to find the answer. New tech ? Comments ?