Marshall JCM800 Lead Series Repair - Major Power Supply Issues

Dive into the second part of a detailed repair video for a Marshall JCM800 Lead Series amplifier, focusing on major power supply issues. Explore the process of testing capacitors, identifying leakage problems, and addressing issues caused by long-term dormancy. Follow along as fuses are replaced, a test speaker is connected, and a Variac is set up for initial testing. Observe the smoke test, voltage check, and initial bias setting. Learn how to troubleshoot pre-amp stage problems, including identifying a failed tube. Watch the setup of the hum pot and thorough testing of all controls with a guitar. Gain insights into the biasing process, including challenges with matched tube sets and the need for mixing and matching. Conclude with the reassembly of the amplifier and final completion of the repair.