RetroHacker
12-07-2005, 10:37 PM
Well, getting further into things in the garage, I did a little poking around in this Zenith console, it's a 23XC36. The sound works, but no HV. As it warms up, the sound comes in first, crackley due to a dirty control, and a whine like deflection whine, then a whisling whine - sounds a lot like a tea kettle. The HOT is glowing an unusual purlple-ey blue. So... I pulled out the HOT and the tube next to it, and both appear gassy. The horizontal output tube (6JS6) is a little browned around the very base, and the getter shows a bit of rainbow-y reddish ringing with a little white, although I don't think that it's gassy enough to have turned the whole getter white. The nearby tube, a 6HS5, is totally cooked. According to the tube chart, it's being used as a voltage regulator. The whole glass is golden-brown, and the getter is largely reddish. So... something caused these things to draw way too much current. The flyback actually looks pretty good, no scorching, although that doesn't mean much. I haven't had time to pull the chassis or do any further detective work on it, this is another one of those things where I figured I'd get some insight on the problem before spending a lot of time - time I don't have. I really need to pull out the chassis and do some thorough cleaning, this thing is filthy!
Hmm, it's weird - it seems every color set I find has some HV problem, where all my previous sets were black and white sets with low voltage problems, or just bad caps in vertical circuits and stuff. With the old B&W sets I normally didn't have to deal with the HV - I was replacing electrolytics and coupling caps and rebuilding vertical circuits, HV just always worked. Here with the color sets, the HV sections seem to be the weak point, which is annoying, because it's the part that I don't understand as well... Sure, I know _how_ it works, but it's still hard for me to put my finger on specific symptoms.
-Ian
Hmm, it's weird - it seems every color set I find has some HV problem, where all my previous sets were black and white sets with low voltage problems, or just bad caps in vertical circuits and stuff. With the old B&W sets I normally didn't have to deal with the HV - I was replacing electrolytics and coupling caps and rebuilding vertical circuits, HV just always worked. Here with the color sets, the HV sections seem to be the weak point, which is annoying, because it's the part that I don't understand as well... Sure, I know _how_ it works, but it's still hard for me to put my finger on specific symptoms.
-Ian