Hi Jon Wilder, the guitar amp is a Carvin AG100D with a pcb of 30-01019-1 Rev.D It has 100W. output. I see an empty fuse holder so I may be mistaking that for the functional fuse circuit. The unit powers up once I plug it in but I have three input jacks and the first channel has no output but the second channel seems to work ok when I plug my guitar in it. On the first channel input I get a lot of popping when I plug my guitar jack in. Looking at the pcb I don't see any components that look or smell burned . On testing the diodes with an ohm meter in circuit some of them read shorts both way which I don't think is right . There are quite a few op amps in the circuit. That's about all I've done, a visual inspection and a basic ohmeter reading. I appreciate your interest Jon Wilder, thank you Mikeara from Arizona