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  #31  
Old 08-29-2017, 10:37 AM
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This is interesting. I found that the color is much more likely to fail when the digital converter box is outputting a garbled, digitized signal than when it is outputting a clean signal. That's not saying it's guaranteed, but that is a phenomenon I have noticed with this set.
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  #32  
Old 08-29-2017, 11:00 AM
dieseljeep dieseljeep is offline
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Originally Posted by TUD1 View Post
This is interesting. I found that the color is much more likely to fail when the digital converter box is outputting a garbled, digitized signal than when it is outputting a clean signal. That's not saying it's guaranteed, but that is a phenomenon I have noticed with this set.
What make of a Digital converter are using? Some are better receivers than others. I find, the Zenith, Insignia units work the best with earlier sets.
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  #33  
Old 08-29-2017, 11:08 AM
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It's a Magnavox from 2009 I found at at estate sale. I really don't like it, because I can only pick up one or two channels clearly, no matter which antenna I use.

Update - I swapped out the Magnavox converter box with the Zenith converter box in the other room. Now, the color does not fail, and I can get all the channels very clearly. If anybody remembers back last December, when I got DirecTV, a few of my TV's at that location did not take kindly to to the new source. A few of them had color problems very similar to this where the color would vanish completely, or they would start barberpoling. I think this TV's chroma circuit is just extremely sensitive to fluctuation from the video source.
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Last edited by TUD1; 08-29-2017 at 11:37 AM.
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  #34  
Old 08-29-2017, 11:38 AM
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Buy a box of those 6GH8A tubes. They will come in handy.
And this might be a good time to swap out the 6GH8s for known good NOS tubes.

jr
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  #35  
Old 08-29-2017, 12:29 PM
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I wonder what would happen if I put a 6KE8 in the color oscillator circuit, instead of a 6GH8, if that would help keep it from having these issues?
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  #36  
Old 08-29-2017, 01:10 PM
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Quote:
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I wonder what would happen if I put a 6KE8 in the color oscillator circuit, instead of a 6GH8, if that would help keep it from having these issues?
If changing the source fixed it, it's not likely a color oscillator problem, but a color phase lock or color killer issue. (Just my 2 cents worth. Anything is possible.) Note, in some sets, if the color oscillator dies, the screen gets a greenish color balance. You didn't mention anything like that. You can try pulling the oscillator tube to see what the symptoms are for future reference.
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  #37  
Old 08-29-2017, 01:58 PM
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There were a few mylar? caps in these Maggies in either
the burst or 3.58 osc that went BUT IIRC it gave bad tint range or
barber pole color.
For now turn the color killer off & be sure the tuner isnt drifting.
Also sometimes there are 2 AFT switches. One often part of the auto
color AKA brownilator & a separate one. Both have to be OFF to properly
fine tune the station.
To test for drift turn all AFT OFF then FT the set so you still get the
channel but it starts to just get wormy & bendy. Watch it like that
for a few hrs & see if it changes. You can also get AFT drift but its rare.
Just leave the aft OFF to fix that.

For a source IF YOU DARE get a low power (10W) translator for a blank channel. If you are high up it will cover your town & much father
LOS.

73 Zeno
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  #38  
Old 08-29-2017, 03:52 PM
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I've sat and watched it with the DVD player for about 2 hours now, and I haven't had any problems.
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  #39  
Old 08-29-2017, 04:31 PM
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Here's the picture it makes after having done no work on it at all. In fact, I have not even removed the back cover yet. Tomorrow, I'll check the tubes, clean it out, set it up, the whole shmagoigle
Nice screen cap of the hurricane. Crisp and clear.

Quote:
Originally Posted by TUD1 View Post
I've sat and watched it with the DVD player for about 2 hours now, and I haven't had any problems.
What a gem .Great color pix too.It looks like not many hour on the CRT in this set.Its stunning to see this today on older sets.

I would pull up a chair and put on a classic TV show from the 1970's and watch it for hours .
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  #40  
Old 08-29-2017, 05:17 PM
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Originally Posted by centralradio View Post
I would pull up a chair and put on a classic TV show from the 1970's and watch it for hours .
Try again...
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Last edited by TUD1; 10-20-2017 at 11:02 AM.
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  #41  
Old 08-29-2017, 05:27 PM
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I've sat and watched it with the DVD player for about 2 hours now, and I haven't had any problems.

Thats great!
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  #42  
Old 08-29-2017, 05:31 PM
Bill R Bill R is offline
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Resolder ALL the ground stakes for the chroma board. ALL of them. They can cause all kinds of intermittent problems.
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  #43  
Old 08-29-2017, 05:50 PM
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Resolder ALL the ground stakes for the chroma board. ALL of them. They can cause all kinds of intermittent problems.
I did.
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  #44  
Old 09-01-2017, 01:27 PM
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Color's still working perfectly as of last night. Knock on wood. I think switching the converter box to the Zenith kind really helped.
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  #45  
Old 09-01-2017, 01:44 PM
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Originally Posted by TUD1 View Post
Color's still working perfectly as of last night. Knock on wood. I think switching the converter box to the Zenith kind really helped.
The picture looks better as well. The Zenith converter boxes have received good reviews compared to other converters, so I would agree with you -- the Zenith box you are now using is probably much better than the box you had before.
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