Re-Tube and Bias a Marshal JVM215C Amplifier

Today's video has it all: high voltage excitement, replacing tubes, and setting the bias...if you are into that kind of excitement! And you get to hear my decidedly inferior electric guitar playing! Also, I get a bit more serious (but only a little bit) at the end. And, if you want to learn a bit more about setting bias on tube amps, this touches on some useful tips and tricks.
For more about tube amp biasing you can check out these useful links:

For a simple bias current calculator:
https://www.amplifiedparts.com/tech-articles/tube-amplifier-bias-calculator

For a more complicated version: https://robrobinette.com/Tube_Bias_Calculator.htm