First thought: check the leads from the amp to the reverb tank. Either could be disconnected and at either the amp to tank end. Next, substitute a known-good 12ax7 for the reverb driver/recovery tube. No change? Now we are going deeper. The lines within the reverb tank could be broken. You'll need to unplug the tank, paying attention to how the leads are connected, remove the two screws through the bag containing the tank, and pull it out. Remove the tank from the bag and look at those tiny leads that go from connector to driver and connector to pickup (at each end of the reverb spring assembly). If broken and you are good with a soldering iron, you can re-solder it. Another option is to replace it.
Back up a step: is this thing in warranty? If so, find the nearest warranty center and advance token thereunto, post haste. Do not insert fingers, do not pass Go.
Bob
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"It is said, 'Go not to the elves for counsel for they will say both no and yes.' "
Frodo Baggins to Gildor Inglorion, The Fellowship of the Ring
THE MUSICIAN'S ROOM (my website)
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