Repairing an amplifier for my queerfriend's brother. The amp was said to be not working on one channel, and it turned out that the fuse socket was loose... Later on another problem showed: the speaker protection fuses were .16A instead of 1.6A and they both blew through bench testing on a dummy load. After fixing those issues, the amp started working correctly.

Recapacitulation followed.

BTW why does Youtube not have basic cutting or rotation functionality in the editor?