CTC 21 goin green

[Chad Hauris]

I would set the service switch to service and see if a red line can be achieved.
Check the grid and screen voltages at the CRT for each color and see how they compare (danger: there can be 800-900 volts at the screen leads, make sure the meter is rated for this)

Most times though I have seen this problem it's been weak CRT's...seems like red gets weak first.

[RCAkid]

Chad,

Ordinarily I would tend to agree with you on the CRT. However, this crt is a reman tube with roughly 20 or so hours on it. Additionally, the emissions are solid on all three guns.

Even besides all that, I had talked about putting a CTC-38 chassis on the tube/yoke and trying it out in my previous thread. When I had the CTC-38 attached to the crt, the color was perfect as was red raster. I stuck the CTC-38 in the cabinet just to verify the yoke, convergence and crt were working correctly.

So I know the problem is in the CTC-21 chassis at this point.

But certainly checking the voltages is one of the first places to begin and I appreciate your help.

I was kinda hoping to save some uneccessary troubleshooting if some of the much more experienced techs out there had any short cut solutions or recalled any trouble spots that I should go for first. It would be nice to know all the circuits are working properly prior to recapping.

[rcaman]

your verticle problem as described to me. sounds like a leaky main filter capacitor. is the picture breathing or have a slow hum bar rolling up the screen. you may have low b+ voltages throwing off the other circuits. feel of the electrolytics and see if they are unusally warm. steve