Single shot tube tester ?

[saturated]

Seems like a person could take one of these

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And build the appropriate circuit needed to test

I reckon simplest example would be a diode rectifier tube.

Just add one of these old power supplies that has the 400 (?) V DC and  6.3 for the heater

Downside would be extremely limited application per configuration

Upside would be the lack of a million knobs and switches and stuff some of these testers look like an enigma machine from Blechley Park

Another downside would be getting killed by 400 V DC

It would be cool though seems one could learn quite a bit from it if he/she survived 

But then me thinks that someone could spend time and money doing it then one of you guys could tell more in 60 seconds with a multimeter 

[J M Fahey]

What's wrong with single trick ponies?
As long as it's a trick you NEED and can't get done otherwise.
I made a quick GO-NO GO tester for power tubes.
I apply 60V to plate, 300-350V to screen, 0V to grid, 6.3V to filaments and measure plate current.
It is the peak current it will pass in a saturated Guitar amp.
Per datasheet a power pentode (6L6, EL34) *must* give me around 200 mA.
_Just look at the data sheet_
IF so, tube is perfect.
IF down to 100 mA: it will "work", sort of, but is quite worn, amp will put out less than half power.
Which _may_ still be usable.
I have measured many "still working" Twins and Plexis with original old tubes putting out 40-60 clean Watts.
Which is pretty loud anyway but far from spec.
Anything less, it goes into the dustbin.