Brilliant work! Absolutely brilliant.
As an avid user of "NOS" valves, I would love having something like this to play with whatever latest discovery of treasures that I may bring back from vintage hunting safari.
My current method involves testing transconductance on Hickok (which leaves alot to be desired) I then take them and match for idle current on a single ended amplifier test jig. The final and most definitive test is actually installation in the intended amplifier, where basically all previous derived data is pretty much moot anyways, and I audition for my perception of sound, tone and essentially playing response.
The most critical parameter at this stage is the tubes ability to remain free of microphonics, fizz and noise.
Not too scientific and very reliant upon personal perception.
Curious if there is a parameter within your data that might predict the suceptibility to a tubes inherent character to be or become microphonic?
Thank you for sharing your posts and keep up the great