Technical Info/Knowledge Hub
Repair Guides
Step-by-step guides written from the workbench. Each one focuses on a specific amplifier model or common repair task.
Repair
How to Bias a Marshall Plexi
A step-by-step guide to safely bias the output tubes on a Marshall Super Lead or Super Bass without guessing.
Marshall Plexi12 min read
Repair
Recapping a Fender Bassman
When filter caps fail, the amp gets noisy, loses low end, and can hum. Here's how to replace them properly.
Fender Bassman10 min read
Maintenance
Power Tube Swap on a Vox AC30
The AC30 is picky about its EL84s. Learn how to swap them without killing the output transformer.
Vox AC308 min read