What might cause an amp to suddenly get very quiet and very distorted? Princeton Reverb circuit. It was a 35watt 6l6 monster, switched the output transformer to take it back to 6v6 tubes. I changed V1 and V4 to brand new JJ's. Sounded great for a day. I can't see any obvious bad solder joints. I tried pulling and replacing V1, V2 and V4 with no change. My tube sockets are super cheap, in swapping tubes could I have lost a socket?