My Zenith has failed!!!

[mattdavala]

I'm sad this morning. While watching cartoons on our 66' Zenith 24NC31/z roundie the sound and high voltage completly died!!!! It was quiet, no sparking or pops. It has been our daily watcher in the bedroom for years(4 years). Since owning it I've gone through two HOT tubes and damper tube, but its been flawless in performance. Its never had anything other than a tube failure before, nothing castrophic.

It seems like a possible power supply issue, BUT the vertical section is working. I can hear it. The speaker seems to have a quiet hum, which indicates that there is power there. I have recapped the power supply and some caps in the vertical section. The rest is origional caps.

I've swaped the horizontal output, the damper, the 6U10 horizontal oscillator, even the video output tube. Nothing!!!

Two of the spare horizontal output tubes' plates glowed red. I am guessing its because with no horizontal oscillator the bias must be off. The tube I had been using in the set didn't glow red. I don't think it failed though, its only been running for a couple of months.

Two unrelated issues, sound and high voltage. This doesn't sound like a common issue, especially with Zeniths! What do I check? Anything before pull the chassis? I doubt replacing one tube will restore HV and my audio. I am not looking foward to pulling the chassis out, and if I do, how the heck do I check voltages?

I thank you for my help to get my beloved roudine working again
Matt Davala