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Thanks again for the great responses! Well, I replaced all of the tubes with a set of JJ's from Eurotubes - no difference (in the reverb response anyway). I then removed the reverb tank and checked the springs as suggested - everything was good there. Made sure the connections were all...

Thanks for the responses guys! I don't think the springs are disconnected in the tank - when I move the head around I can hear that distinctive "klaaaanggg" that accompanies such an act when the amp is on. Based upon what I've read in owner's manual, I figured that if one of the tubes...

Hello All, I recently purchased a Mark IV head and 2 Theile cabs from eBay. So far I'm really impressed with the amp; however, the reverb does not appear to be working at all - is this likely a tube issue? Also, at moderate-to-high volume levels I'm getting radio broadcasts through the amp...