Marshall JCM 2000 chassis
This one suffered a massive blowout due to being turned on with no speaker cab attached. After a minute or so the output transformer destroys itself and more. This tube socket is done. All burnt up.
Solder side for the four PCB mount power tube sockets. The two pin 3’s that connect directly to the output transformer are burnt off the board and the solder is now just a vaporized remnant. Victim of inductive kickback.
View of the same section of the board but from the other side, where the tube socket used to be. The total damage was the power tubes were destroyed, one tube socket was destroyed and the output transformer was shorted. Expensive repair unfortunately.