Literally! Cranked up the ol' 76 Vibro Champ about a month or so ago, made a weird staticy sound, then smoke started coming out the inputs. Finally got around to looking at it. All the tubes light up, but the 5Y3 tube isn't very bright. Seem lacking, but I'm not in the habit of looking at the tubes when the amp is working. Pulled the chassis, and nothing is burned. Think it could just be the tube? Any other thoughts? P.S. I usually take it to Andrews Amp Lab, but I'd like to avoid the cost of having it worked on if possible. Then again, I'll do it if its more than a tube swap.