How to: Biasing Marshall Tube Amps 1987X and tube matching Bias Master in use | tonymckenziecom

I recently bought a 1987X reissue 50w Marshall Amp and decided to show how to bias the amp after a tube change. There’s lots of useful information about tubes, matching etc. and shows how to do things the easy way. This video shows the TAD Bias Master in use too and a few things about two new tubes that were mismatched and how to solve that. Later Ill be making a video of how to convert this amp to master volume and some other nice tweaks and in this video I show why I chose this amp as the platform... and