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#46
06-30-2015, 02:12 PM
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Could be insufficient drive signal to the horizontal output tube. Do you have a scope ? Also I believe there is a 470K resistor on the second anode that may have gone way up in value. Could also be as simple as a weak 1B3 rectifier tube.
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#47
06-30-2015, 08:27 PM
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I already replaced that 470k resistor that was inside the 1b3 tube socket. I also tested my 1b3 tube and it tests good on my tester. I have the horizontal drive control at it's max setting and get as high as 5000v, instead of 10k.
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#48
07-02-2015, 08:43 PM
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I disconnected the doorknob cap, to see if it was shorted and pulling down the hv; but there was no change. I think I'm left with changing the flyback with a nos one a friend gave me.
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#49
07-07-2015, 02:34 PM
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Finally made the molding that was missing around the side louveres. Still working on the flyback issue.
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#50
07-28-2015, 01:58 PM
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Decided to take off the remaining flaking aquadag and spray on a new coat.
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#51
07-28-2015, 03:50 PM
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Picture tube is now recoated!
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#52
07-28-2015, 03:53 PM
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I found the little sliding focus range switch, which allowed me to make the picture sharper and much easier to view, but still only at 3000-4000 volts to the second anode. Still trying to figure out what's pulling that down....
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#53
07-29-2015, 02:27 AM
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Nice to see your progress.
__________________
Chris Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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#54
08-02-2015, 02:52 PM
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Flyback help!!
I'm wondering if I should try my zenith flyback replacement. This one cleaned up pretty good, but still wonder if it's weak? Do flybacks become weak or is it a situation where they either work at or not?
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#55
08-02-2015, 04:55 PM
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Could be going south, but I'd make sure all the horizontal adjustments, B+ voltages, and H output tube voltages/currents/waveforms are right first.
__________________
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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#56
08-02-2015, 05:19 PM
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Well if you have a replacement then swapping it in to see if that fixes it isn't all that hard, but first, have you swapped the 1B3 Rectifier yet?
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#57
08-02-2015, 06:27 PM
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Yes, uve tried three different 1b3 tubes s and no change.
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#59
08-05-2015, 10:02 AM
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I did a continuity check to see if shorted, but nothing. I don't have another to sub in to see if it's lesky. I believe it's the common 500mmf Orange cap.b I tried the set with it disconnected and no difference. Do you think that's it? Where can I find another?
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