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Old 09-11-2018, 08:23 PM
Tellyrescue Tellyrescue is offline
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Deader than dead CTC-9

Recently acquired this RCA CTC-9 metal cabinet set, yoke is charcoal along with the horizontal width pot. Knobs are gone and the cabinet has a nice scar on top right corner.

Hope to get it glamed up and working as a daily driver.
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Old 09-11-2018, 08:26 PM
Tellyrescue Tellyrescue is offline
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Old 09-11-2018, 10:08 PM
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bgadow bgadow is offline
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Great project-some real sharp repairs on that set! Proves that there were always hacks. Lots of fun to bring something like this back from the brink.
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Old 09-12-2018, 12:14 AM
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Penthode Penthode is offline
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I have a CTC 11 which was similar. It was great fun solving the problems. The if coils had disintegrated and found exact replacements at a nearby electronics surplus.

Patience and dedication will see you though!
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Old 09-12-2018, 12:25 AM
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Electronic M Electronic M is offline
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If the width pot is the one with the green wire and the brown half a lamp cord wire to chassis, and you judged it with your eyes instead of a multimeter then you may find that it still works...That one seems to use black plastic to hold the resistance material and terminals (instead of the brown phenolic of the other pots) and is likely still just fine.

The yoke is not so much charcoal as disintegrated plastic. The early plastics used for the outer shells on most yokes before the mid 60's were very unstable and will rot away on their own...This even happens to unused mint in box NOS specimens.

The windings and important core parts look fine and are probably still safe and functional. The shell can be recreated with a little effort with modern plastics. The part that usually rots away only acts as a mount for terminals as well as a guard to make it difficult for a service tech to accidentally grab those terminals with the set running (it also is supposed to be the grab handle to adjust the yoke).
You want to avoid touching the yoke terminals if the set is powered on...The meanest shock I've ever gotten from a TV set was a CTC-15 clone that I touched a portion of the yoke winding where the insulation was bad...That is the only time I can remember my 'let go of this' reflex kicking in full strength...
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Old 09-12-2018, 10:11 PM
Tellyrescue Tellyrescue is offline
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Quote:
Originally Posted by Electronic M View Post
If the width pot is the one with the green wire and the brown half a lamp cord wire to chassis, and you judged it with your eyes instead of a multimeter then you may find that it still works...That one seems to use black plastic to hold the resistance material and terminals (instead of the brown phenolic of the other pots) and is likely still just fine.

The yoke is not so much charcoal as disintegrated plastic. The early plastics used for the outer shells on most yokes before the mid 60's were very unstable and will rot away on their own...This even happens to unused mint in box NOS specimens.

The windings and important core parts look fine and are probably still safe and functional. The shell can be recreated with a little effort with modern plastics. The part that usually rots away only acts as a mount for terminals as well as a guard to make it difficult for a service tech to accidentally grab those terminals with the set running (it also is supposed to be the grab handle to adjust the yoke).
You want to avoid touching the yoke terminals if the set is powered on...The meanest shock I've ever gotten from a TV set was a CTC-15 clone that I touched a portion of the yoke winding where the insulation was bad...That is the only time I can remember my 'let go of this' reflex kicking in full strength...
I measured the component out of circuit and it will need to be replaced as the carbon track is ruined.
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Old 09-13-2018, 07:25 PM
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irext irext is offline
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I am fairly certain that yoke is cactus. A ring test should prove it. I've seen yokes looking like that before and they were all crook with shorted turns.
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Old 09-14-2018, 01:57 PM
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Sparky Sparky is offline
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Working on one right now. Bad Bubblebees in the horizontal circuit. Nasty things that they are.
Dump the Black Beauties as well, and of course paper.
The set is like new now. Not to rub it in, just to say I feel your pain. Pix to follow...

Last edited by Sparky; 09-14-2018 at 02:03 PM.
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