05/21/2026
1979 Marshall JMP MKII 100W came into the shop after sitting for most of its life packed away it a basement. Two output tubes were missing as well as a preamp tubes. Started by replacing the broken fuse holders. Replaced the original Daly can caps. Replaced the bias supply capacitors. Installed a new quad of EL34s and 1x12AX7. Pretty straightforward repair. Sounds great.