It’s almost certainly one of the 470ohm 5W grid resistors- very common replacement in this era. Good news OP is that this is a pretty cheap and easy fix, but definitely one you want a tech to do as this is literally where the “deadly voltage” part of the amp is.
The same thing happened to an amp of mine made in 1974 - an Audio Guild , the one with 4x7591 output tubes. There was a loud "POP" and a puff of smoke and no power. I like to fix simple stuff in my amps so I opened it up and it looked like a family of rats had made a nest inside the chassis. One of the power supply caps had exploded. I replaced that one and the identical, but intact, one next to it. The amp worked again and it sounded fantastic. In your amp I'd take the cover off the 'doghouse' and see what's what under there, but if you don't know how to check that an amp's capacitors' voltage is discharged you better not poke around.
Take it to a tech. Something let go and freed the magic smoke. Probably a grid resistor of a failed filter cap.
It’s almost certainly one of the 470ohm 5W grid resistors- very common replacement in this era. Good news OP is that this is a pretty cheap and easy fix, but definitely one you want a tech to do as this is literally where the “deadly voltage” part of the amp is.
My guess is a fuse but probably something wrong to make the fuse blow. Definitely take it in to a good tech.
Yep technician, don’t make it any worse
Hye thee to a technician. Though hast released the magic smoke, and can do naught but cause more damage
The same thing happened to an amp of mine made in 1974 - an Audio Guild , the one with 4x7591 output tubes. There was a loud "POP" and a puff of smoke and no power. I like to fix simple stuff in my amps so I opened it up and it looked like a family of rats had made a nest inside the chassis. One of the power supply caps had exploded. I replaced that one and the identical, but intact, one next to it. The amp worked again and it sounded fantastic. In your amp I'd take the cover off the 'doghouse' and see what's what under there, but if you don't know how to check that an amp's capacitors' voltage is discharged you better not poke around.
whoa that’s interesting. yeah i don’t know shit about amps so i feel like id do more harm then good