Hoffman 7M112 tabletop

[robert1]

Originally Posted by Phil Nelson

After about 90 seconds on the tester, the needle cruised up into the happy zone.

That's typical of any C.R.T. that has sit unused for many years.. it usually takes about 15 miniutes of warmup time for it to come up to full emmission.

Originally Posted by Phil Nelson

It may not be the greatest tube on Planet Earth, but I'm betting it will make a picture. I'll set the brightener aside and try the set bareback when its turn comes.

by the looks of the meter, that appears to be a strong healthy tube.
you may need to examine that "brightener" to make sure that it is not a 1:1 ratio isolation transformer. that tube may have had a intermittant fil to cathode short.