Marshall DSL40CR - Troubleshooting Power Tube Noise Issue (Including Replacement and Bias)
I investigate and fix a noise on a second hand Marshall Amplifier, present all the time on High Output mode, even with volume down. I replace and bias the tubes. I am still working on my audio/micing, so it is not picking up the amp sounds (I think they are getting auto-processed out, on hindsight I should have used a 2nd Mic).
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