You could unmount the reverb pan and set it behind the amp on a towel. Is it still there? With the amp on, reverb level high and while listening to the hum (amp volume low) slowly rotate the actual reverb pan to it's side, then upside-down and see if the hum changes. You will get the typical reverb crash if you jostle it obviously. But if the hum changes significantly as you rotate the pan, I would say your pan is shot.
They are about 28 dollars. You ruled out tubes, assuming you used know good ones. You ruled out the footswitch and cable by unplugging it. All it could really be is the pan or the cable to it. Z amps are really well built. I doubt it's anything internal.
Last Edit: Jul 7, 2017 18:41:56 GMT -7 by nicholas
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