CTC-4 Director 21

[dieseljeep]

Originally Posted by MRX37

"Ahhhhh! Patrick! The screen looks like a fishbowl and I see wavy lines everywhere!"

I looks like IF strip ringing, by either a bad tube or loose connection. I hope, it's not an alignment issue.
Is the CTC4, the only RCA set, that used the 6AZ8 tube.
My Knight-kit R100 receiver uses two of them.

[SwizzyMan]

Originally Posted by dieseljeep

I looks like IF strip ringing, by either a bad tube or loose connection. I hope, it's not an alignment issue.
Is the CTC4, the only RCA set, that used the 6AZ8 tube.
My Knight-kit R100 receiver uses two of them.

I sure hope it isnt alignment. I'll take a look

[SwizzyMan]

Starting to think this may need an audio alignment. I can fine tune in a clear color picture, but the sound isnt there just the loud buzz of the modulation. When i turn the fine tuning knob to receive sound, the picture gets a lot of interference and the swirly lines show up. In other words the audio is not at the same tuning position as the clear picture signal. I suspect an audio alignment may be necessary.

[miniman82]

Hope it's not the same issue mine has, the audio went totally kaput on it one day and I think the IF can has an open winding or something. I can twiddle any slug I want, all it does is sound like a radio not tuned to any station. Gotta dig back into that thing at some point.

[Electronic M]

Originally Posted by miniman82

Hope it's not the same issue mine has, the audio went totally kaput on it one day and I think the IF can has an open winding or something. I can twiddle any slug I want, all it does is sound like a radio not tuned to any station. Gotta dig back into that thing at some point.

Might want to check that it don't have silver mica disease.

[Phil Nelson]

Originally Posted by SwizzyMan

the audio is not at the same tuning position as the clear picture signal. I suspect an audio alignment may be necessary.

Is there any fine-tuning spot where the audio is loud and clear? (That would rule out silver mica disease and show that your audio section is basically OK.) On some sets where the audio has separately drifted away from the video, you can "walk" the audio alignment back into step with the video by carefully tweaking the audio adjusters while watching and listening. This is lower-risk than attempting a full-dress alignment of video and audio IFs.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[SwizzyMan]

Originally Posted by Phil Nelson

Is there any fine-tuning spot where the audio is loud and clear? (That would rule out silver mica disease and show that your audio section is basically OK.) On some sets where the audio has separately drifted away from the video, you can "walk" the audio alignment back into step with the video by carefully tweaking the audio adjusters while watching and listening. This is lower-risk than attempting a full-dress alignment of video and audio IFs.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

No matter where i fine tune the audio its always got that horrible overmodulating hum (not filter cap hum). It gets louder as I turn the knob to the right.