I have next to me one RSD PL95 and I have no one to hand it over even for free.
At my past, long way back, I was using tubes for making FM broadcasts transmitters,
and we made rich the guy who was selling tubes and spare parts in our town.
Tubes and sound systems was always one less attractive commercial sector.
It is not a wonder that the industry of today abandoned this sector.
Tubes for high power FM VHF radio bands, are still circulating, but most countries are passing now to digital radio, Greece is an exception even to that.
It is interesting the fact, that one new factory started to make tubes in Russia in our days.
And probably it will make some money, because now days there is no other options.
I have see tube testers, it was not that much for measurements, I would rather say that was good mostly to use them as one simulator.
The quick way to test and see if the problem is the tube or the circuitry.
Another use of the tube tester was to find matching pairs of tubes for preamp s.
Calibration reports about tube testers?
Those tube testes was so expensive that it was owned mostly by companies who was making repairs,
all of those people are now retirements.
I do understand your hallow of frustration
about something that you love which is not supported today, but I have no other cure than a red glass of wine.