CTC-4 Director 21

[andy]

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[Electronic M]

Originally Posted by andy

Some things I've run into are accidental shorts in a tightly packed point to point chassis like this, or breaking one the the fine wires on a coil or transformer when it connects to the terminal.

CTC-4s have PCB IF, sound, and parts of other stages.

[SwizzyMan]

changed the channel to 4 and subbed the 3rd IF tube. Not much difference, but now I can get a pretty clear b&w picture, but when I turn on the color all the interference shows up. Once I get rid of all color the interference goes away. The fine tuning knob still has only an eighth of a turn before I lose sync, but about half way through the 1/8 turn clockwise the color starts to fade but does not disappear and the overmodulation hum gets louder.

[SwizzyMan]

I must also note that none of the tubes are shielded. I'm sure that isnt helping my interference problem anyways. And Dave, according to the previous owners the set hasn't been powered up since last December.

[Electronic M]

Originally Posted by SwizzyMan

I must also note that none of the tubes are shielded. I'm sure that isnt helping my interference problem anyways. And Dave, according to the previous owners the set hasn't been powered up since last December.

The IF tubes and a few others are supposed to have shields....I recommend finding some shields before messing with it too much.

[Hagstar]

I must STRONGLY agree about the shields. My CTC4 is extremely fussy about some of them being grounded well OR I get weird diagonal lines or loud humming.

John H.

[SwizzyMan]

Roger that. Most of them are in a separate box that the set came with

[andy]

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