Built a Heathkit tube tester in 1975; and had reason to use it the other
day.

Just wondering if there is any source for updated tube data since then?

--
"The whole aim of practical politics is to keep the populace alarmed-
and hence clamorous to be led to safety- by menacing it with an endless
series of hobgoblins, all of them imaginary. "--

H.L. Mencken