Just bought a deluxe reverb that I plan to eventually use as a donor for a full on upgrade to the original specs (retro-grade?). The man that sold it had 2 amps, and wanted a bunch for them. They were 100% clean and had a good record of maintenance since new, had been crated to gigs and are both great sounding amps. For a price discount I let him pick the amp I would take home and I got the one with the replacement MOD reverb tank on board. Home, plugged in and happy with my purchase, except that the tank goes to full on reverb tank echo mess at anything more than 3 or 4 on the knob. Useless beyond that, a cacaphony. Of course I checked and it is the right tank for this amp. and it is mounted well and seems free to float without feedback from the cabinet. Without any experience with this amp model and little tank experience, I am just hoping you guys will share experiences that you might think I can learn from. It seems pretty straight forward from here- I suspect a faulty 20 dollar tank rather than a failing amp that is perfectly fine in every other way. Accutronics tank is on it's way as I write this.