#1
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Ghost Issue
My '59 RCA ctc-9 has a ghost image that I can't seem to get rid of. Any input would be appreciated. I use the same dvd player and rf converter with my other tvs so I have ruled that out. The fine tuning adjustment does nothing to get rid of it. Don't know what else to try. the ghost image is only on the right side of the picture.
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#2
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Caps?
How long have you had the set and did you recap the power supply? I have seen weird things due to power supply caps.
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Tom Smrz |
#3
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Try subbing the last IF tube.
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#4
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I have had the set about a month. Previous owner recapped the set. I replaced one of the tuner tubes, the 6EA8 because the picture was "grainy". The tube was bad (shorted),that took care of that problem. The 6BC8 was "gassy" but seemed to be ok otherwise. I think I will scrounge up another one of those to see if that helps to get rid of the ghost.
Last edited by VA561; 12-20-2015 at 05:10 PM. Reason: correction |
#5
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99% of the time it's either a wore our detector crystal or the IF alignment is funky. I can bring my jig over, but it's a pretty involved process.
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Evolution... Last edited by miniman82; 12-25-2015 at 09:57 PM. |
Audiokarma |
#6
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Does the ghost move sideways as you adjust the fine tuning?
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#7
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I had the exact same problem with a CTC 9 many years ago. Ghost is to the right of images and does no go away with anything. I did find the problem though. One that most techs never think of. It's caused by a bad delay line. Short across the input and output of the delay line and I bet it disappears although the color will be offset. I can almost bet the ghosting will be gone. Just find another delay line from another old retro RCA. Replace it and you will have a nice ghost free picture.
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#8
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I 2nd the delay line. Had a few on 60's sets IIRC RCA's.
Also is the 6EA8 in the IF ?. Usually its mixer / osc in the tuner. After the delay line do the IF tubes & sub the tuner to be sure. Alignment a LAST resort & I wouldnt do it without 3 NOS exact number IF tubes........ 73 Zeno |
#9
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"Does the ghost move sideways as you adjust the fine tuning"?
No, the ghost pretty much stays where it is throughout the tuning adjustment. "Also is the 6EA8 in the IF ?. Usually its mixer / osc in the tuner." Yes the 6EA8 is in the I/F. It is the mixer osc. __________________ Last edited by VA561; 12-20-2015 at 04:52 PM. Reason: punctuation |
#10
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The mixer osc. is NOT part of the IF, but rather the tuner stage which feeds the IF.
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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 |
Audiokarma |
#11
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Sorry about that. It is in the tuner stage.
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#12
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Quote:
But it sure can't hurt to sub 'em all before even considering alignment. |
#13
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I'll test the three I/F tubes tomorrow. It's easy enough to check those first.
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#14
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3rd in the delay line, but maybe a terminating resistor has changed value? If that happens, some of the signal will bounce back to the delay line input, and back again.
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#15
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It's ringing somewhere, detector, or filter circuit after it....
.
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Yes you can call me "Squirrel boy" |
Audiokarma |
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