See a very thorough, in-depth repair and modification of an old Thordarson T20W40 tube amplifier. This includes the "thought behind" the modifications, and schematics as well. There is a description behind the troubleshooting process as well as another description for the failure points.
Check out the Wayward Hearts here:
https://www.youtube.com/watch?v=tkEw5IEy1KU
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