Yes, that's the 'Light-show' all right. I only noticed it after clearing flyback problem from chassis (after recapping) which restored B/Boost, Focus, HV -- but didn't see this glowing with CRT tester.
This CRT won't even achieve "cutoff" set up (on B&K tester) or "Gun Balance" (on Sencore tester) so no chance of emission - tho I didn't crank up filament beyond 6.3v(taking it easy considering gun assembly may be suitable to be reused in rebuild).
Now that chassis is done , will look at using a 21" Rauland or Zenith glass tubes that I have (not fully original I know) and store the AXP in hope of future plant operation.
There'll be a lot of business waiting for an operational CRT plant.
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