[hsusmann]

Yes, I am running the 80 tube outside the radio
on a lab supply. So far I've run it a total of about
12 hrs and I already notice a difference in the color
of the glow.

It started out blue but now is violet.

I am going to run it for a few more days and then
go to full filament voltage and run it another few
days and see what happens.

Herb S.