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#16
10-12-2016, 03:56 PM
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I've got a bunch of these, 2200uf at 35v. Will these be ok?
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#17
10-12-2016, 04:06 PM
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Bob, what would you use for C4 and C5?
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#18
10-12-2016, 04:16 PM
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1,000uF rated for 16 volts or higher. Low ESR types if possible.
2,200 will result in an impedance of 0.6 ohms. Probably fine. I think using too small would be an issue but not larger. No harm in trying them.
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#19
10-12-2016, 04:51 PM
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I suppose originally they kept the voltage rating so low in order to make the caps smaller, now days that size restraint is no longer an issue.
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#20
10-15-2016, 07:54 PM
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I slid the CRT and its heavy mounting bracket out of the cabinet so I could clean the CRT face. Plenty of orange nicotine came off before it got clean and shiny. I also put a little super glue on the CRT socket because it was just a little loose. The focus control came in today so I'll install that while I wait for the caps to come in.
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#21
10-19-2016, 11:43 AM
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The main chassis is completely recapped. I still have to recap the small am/fm chassis. I slowly powered it up and have a raster! So far I don't have any video coming through and Ive checked all of the video tubes.
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#22
10-19-2016, 11:45 AM
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Here is the main chassis after recapping...
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#23
10-19-2016, 09:35 PM
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I wiggled a tuner tube and finally got great fm radio. It looks like video is trying to get through, but no video yet. There is a jack on the back I think is where I would plug in a DVD player or some video source, as the only screw antenna jacks is on the am radio chassis. If you look in the picture it's the little rca style jack in the back center of the chassis. The schematic only shows the table model, which does not show the seperate am chassis. Any thoughts or anyone that has restored this model?
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#24
10-20-2016, 12:48 AM
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Quote:
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#25
10-20-2016, 06:59 AM
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Quote:
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#26
10-20-2016, 08:55 AM
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Eric, I noticed that too about the ion burn on the center if the screen. It's not super noticeable with a raster, but it's there. I'm just happy this oddball CRT tests very strong.
Tom, thanks for that info! I'll get one of those jacks and give it a try!
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#27
10-20-2016, 10:02 AM
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I've got my audio locked in and I can almost see the video. Is there not a horizontal frequency control in this set? I only see the horizontal hold control.
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#28
10-20-2016, 12:31 PM
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Some Dumonts had a nut on top of the H osc transformer can that would act as a coarse hold/H frequency control....If it has the can and there are adjustable slugs that may be worth doing...If no nut I recommend checking the waveform with a scope while adjusting the transfmr.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4
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#29
10-21-2016, 12:00 AM
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The horizontal oscillator transformer in this set has a round disc that you turn with your hand to adjust horizontal hold. I backed it in and out with no locking picture. I'll check resistors around this transformer and in the sync circuits and hopefully find the out of tolerance resistor causing this.
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#30
10-22-2016, 12:37 AM
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I replaced several out of tolerance resistors in the horizontal sync and sync clipper areas, but nothing changed. Still can't get the horizontal to lock. Any thoughts?
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