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Quick confirmation needed here.
When I fixed the flyback on my CTC-5, 21AXP22A guns started to glow neon blue & red. I had assumed the tube would have been fine but now tested it and filaments light nice deep red (meaning air not a problem ? as I would expect warmer orange color with air present ?)
On B&K tester a "short" shows up (in fact a 68 k ohm leakage heater-to-blue cathode)
B&K book said in this case use an isolating filament transformer - which I did but same symptoms --- and, by the way, ZIP in the way of Emission.
So is it air ? Who rebuilds these now?
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