His name is Bryce Bickham, located in Mesa, AZ. He had a website at crimsontone.com, but it's gone now. I'd like to speak with him about a few aspects of the work he's doing (assuming he's still doing it).
Here's a pic of a panel that he posted to another forum a few years back:
Troubleshooting Basics:
Step 1: Remove and discard all JJ tubes.
Step 2: Highlighter test.
Step 3: Use a Voltage Chart from the downloads section to test your voltages.