12UP4 condition

[EdKozk2]

Originally Posted by cluelessgame

does this mean you're turning the filament into the cathode itself?
I may have to try this with the 21ZP4 in my Admiral. I think it has the same issue

I would have to say yes to your question. The method I used is basically the way a battery operated tube radio from the old days was wired. Only this method must be isolated or you will burn the crt's filament. Also note that if you have your video and brightness being input on your cathode this may not work. The Zenith set I have has the video on grid #1 of the crt.
Ed