My Brand New CTC-7!

[old_coot88]

Hope he's familar with the degaussing procedure.

1. Have the TV in the location and position it's to be used in, and have it warmed up and running.

2. Have the degauss coil at least 6' away from the set, then turn it on.

3. Move it in and do the degaussing, then move it at least 6' away before turning it off.

If it's turned off while close in, it will gauss the set instead of degauss it.

[SwizzyMan]

Also please note I am using a degaussing coil from a junk TV. I am not 100% sure that I may be doing it completely right. Does anyone have a good video explaining the process in depth?

[DaveWM]

are there edge purity adjusting magnets? look at the mounting ring on the CRT, looks like large metal elongated circlips.

Also yoke droop may be an issue.

here is a degauss video

https://www.youtube.com/watch?v=7ks1uI7g_7k

[SwizzyMan]

I think I do see those they are a u shape and on the convergence assembly where the magnets for static convergence adjustments are.

[DaveWM]

no they are on the CRT mounting ring if you have them. NOT on the convergence or yoke. see pg 21 of the factory service manual.

[SwizzyMan]

They look like little clips? I think I see them.

[DaveWM]

see pg 21 of the factory service manual.

[SwizzyMan]

Ok I see them now.

[dtvmcdonald]

To check whether little magnets around the edge are the solution,
try a refrigerator magnet. Don't hold it close unless that cures the problem ...
you could magentize something. Bring it up slowly from the side towards the
problem area, rotating it every possible direction as you so this.

I've used this method with a CRT device we use in my Physical Chemistry
teaching lab: the beam in it normally runs from 10 to 150 volts over all but the
last 1/8 inch .. imagine a 5 inch CRT with a shadow mask, the cathode
at 0 volts, final grid in gun and mask at 10 to 150 volts, actual screen at 5 kV.
Magnetic field nightmare. Little magnets work great.

[WISCOJIM]

Originally Posted by DaveWM

are there edge purity adjusting magnets? look at the mounting ring on the CRT, looks like large metal elongated circlips.

Also yoke droop may be an issue.

here is a degauss video

https://www.youtube.com/watch?v=7ks1uI7g_7k

And if you look at about 13:20 in the following video you can see how it looks when backed away from the set and not using the variac.

https://www.youtube.com/watch?v=Awd-...ature=youtu.be

.

[SwizzyMan]

I have also noticed that on the first 15 minutes of having the set on the focus is really bad and everything is blurry and has a 3d effect like bad convergence. After about 15 minutes it fixes itself.

[SwizzyMan]

Drat! Just lost my color again. This time no faint colors in the color bar pattern. This happened as I was moving the yoke while doing a purity adjustment. What happened?

[MRX37]

I'm thinking a loose connection somewhere.

The fact that your TV "fixed itself" after it warmed up suggests that and I doubt futzing with the yoke would cause color loss on its own.

[old_coot88]

Is the color killer control turned fully to the 'wide open' position?

[SwizzyMan]

Is that on the chassis in the center of all the color circuitry tubes?