Thanks Blumlein 88. That's a generous bunch of information.
However, I'm the furthest from a DIY guy you will find. If it's not essentially easy for me to do the test it won't happen, and the above is getting too far down a rabbit hole for my comfort level. I may even have sprung for the switchbox I linked to earlier, but with my industry hit hard by COVID money is tight.
Hi Matt:
I am into DIY and am going to modify a switcher I have to be "tube friendly" per Blumlein 88 and SIY and run some tests. When I am done (and have proven the modified switcher works right) I can send it onto you.... as long as you promise to send it back when done