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Old 01-22-2021, 11:33 AM
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Yamamaya42 Yamamaya42 is offline
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Join Date: Nov 2018
Location: Round Rock TX
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I have noticed a slight ghosting problem with my CTC-16XL, very much like seen in this thread,
http://videokarma.org/showthread.php?t=265940

I can say right now however, this is NOT a tuner/if problem, because it is seen with both RF input and on bypass/ direct AV input, so I'm already suspecting the old delay line, I had already been wary because it looked rather raged and abused to star with (beat up, tape peeling off, etc ), but like other things, I deem this a minor annoyance, and will be looked into later.
This may or may not be related to the other minor problem of shadowing on the screen of bright text/ letters.

Things I intend to do to try to address this is replace both the 1st/2nd video amp ( 6lf8) and video output (12by7a ), they are a bit old, and I'm not sure how up to par they are, I'm sure that NOS tubes would help.
There are still a few film caps in the circuit that are original, they say they don't go bad, but who knows, they may have degraded a bit, so it won't hurt to replace.
And as mentioned before, all resistors on the color PCB were replaced before I got the set, and checked by me, so they are OK.

A delay line problem will be tricky to deal with I'm sure, ( repair/replace? )
It should be easy enough to bypass it from the top w/o removing the chassis, that will at least tell me if my guess is right, if it is then what to do...


One thing to try, but I'm not sure what effect it will have on the old delay line, will have to try and see, wrap with layer of kapton tape first, then copper tape over that, with ground wire soldered to both ends, and then another layer of kapton tape over that. And see how it behaves.
If it's still acting up, there is places to get a NOS one, but I'm not exactly sure which one to get if I have to resort to that.
https://www.vivatubes.com/nos-nib-mi...dio-amp-parts/
They have many to pick from, and I'm not sure which is right for my 16.
But at least, if it is the old delay line, there is a way to get a replacement.

But as i said, this will be looked into later.
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