Okay, if this seems familiar, it's 'cause I JUST got my '73 Bandmaster Reverb back from the shop. In July (I think), I had asked the forum about why it went ga-ZAP, complete with smoke and screaming electrons sounds, back in the summer after exactly 60 min. playing time, after the first repair guy did apparently not enough to it. And I just posted this yesterday, about the second round of repairs, with a different, seemingly very professional repair guy: https://www.tdpri.com/threads/is-a-7522-12at7-anything-odd-3-other-73-bmr-questions.1049645/ Didn't have a chance to turn it on until today. And NADA. Very slight background hum/it's-working sound with it on standby. That sound gone, and NO sound forthcoming, when standby flipped off. Checked cable and guitar through two other amps. All okay. Check the BMR's speaker cab through another amp head. Just fine. Even checked if somehow the standby on/off got reversed but no sound when it's on standby, either. So yes, back to the shop it will go! Will have to wait until next week due to work, but damn, this is frustrating. I drove it home carefully. It was sitting on the passenger seat, all but buckled in. Had my hand on it the whole way, in fact. Pilot light comes on and stays on, nice and steady. Tubes light up. A very slight electronics/ozone/warming tube smell. Checked all the guitar inputs, all the knobs. Made sure I was in the right speaker input. Repeatedly. Triple-checked speakers, cable, guitar. But NADA on any sound! Any take on this? What the hell could've happened between the shop and being walked 100 yards to the car, riding home stably, being baby-carried into the house, and set carefully atop the speaker cabinet?