Diagnosing & Repairing Marshall JCM-900 100W Hi-Gain Dual Reverb 4101

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Here's a model 4101 Marshall 112 combo with 5881 power tubes. This amp had red plating EL34 output tubes when I got it. The fault was found to be with the C15 capacitor in the bias supply. Also needed a changed Master Volume pot on Channel 1. While I was at it, I went ahead and moved the pots to the chassis and ran wires to them (a reliability improvement). I also demo the tone about halfway into the video before I realized I needed to change a pot.

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