...More tubes for the collection...or to make a VU meter when I have time.
Needed two, bought 4, just in case, luckily only one failed testing.
and the last one:
...looks around 10 "dashes" in difference between these two tubes, in any case it's not a measuring instrument and can be corrected on the control circuit. Also no precision supply used.... only 84 Vac from 230 to 12 --- 12 to 115-0-115 transformer arrangement (using only one 115v output):