Hi all, hope this post is in correct spot. Situation, I have a 1974 silverface pro reverb iv had for maybe a month or so. Got it in a trade. and have been having some reverb problems. Its weak. Basically no reverb until 5 on dial. At 5 its is okay. Things iv done, checked all rca connections, tried different rca cable. Same results, swapped out reverb tubes for known good ones. Same result. Put originals back in. Could a failing tank be the culprit? Or maybe a resistor type deal in the reverb circuit? Any help would be fantastic and much appreciated. Noted V3 reverb tube gets super hot. Super quick. Resistor? 2nd issue, some chords have a glassy ringing overtone to them reverb just makes the issue more apparent. Swapped v1 and V2 with known good tubes. Basically same result. While tapping on tubes looking for microphonic, all were quiet except (looking at tubes from back) the right power tube, when tapped makes a static, crackle sound. No crackle or static from amp when playing. Other power tube quiet. Same for rectifer tube. Quiet. Most likely installing a SSRetifer. That's aside the point tho. Appreciate any help. Thanks to all. for reading.