Update:
Due to the impact on my health and the lack of parts availability due to COVID-19 causing a lack of originally designed electrical components (vintage values of resistors and capacitors), major specialty designed parts like transformers, wire wound potentiometers (pots), special designed switches, and meters in some makes and models, I no longer will be servicing any make, or model of Tube Tester.

I am now only working full time to track down the required parts needed in order to complete all testers in my shop and get all in-house jobs finished as soon as I can. Most of my medical issues are now behind me and some are being treated as well.

I will in the near future only provide some specially developed service manuals I will be making, and meters for a limited group of Hickok and military tester models.