Zenith Roundie Still Not Running

[mattdavala]

On my Zenith roundie, a 24NC31 model I had a B+ power resistor that supplied B+(270V?) to the oscillator section and hortizontal output tube fail. It opened, killing the bias. Horz output tube died with the plate glowing red. My damper tube survived the ordeal. I know my issue was different from what you are experiencing, but I'd thought I'd throw this out there.

Ah, a key to me finding that resistor was that it also killed the B+ to the audio output section as well. Kind of odd, loosing HV and audio.

Replaced resistor and horz output tube got me working again.

Hope you get your running. Mine has been a daily watcher now for 4 years, with a few minor hicups one of which is told above. I did loose a damper tube in the 2nd year of opererating it. It failed peacefully, and replacing it brought my HV back. It has slight vertical jitteryness, and I know some caps in the vertical section will need replacing.

Lets hope when you get this sorted out that you'll have a worry-free Zenith roundie.
Good luck,
Matt Davala