CTC-9 from North Hills CA

[freakaftr8]

Well I haven't tested tubes yet but I have done some more adjustments on the set tonight. What I have noticed is that the raster lacks the contrast it should have. When bright scenes come in it kind of blooms out of focus. I have a feeling that the 3a3 is prob a little weak as well as some others. The brightness is there it just doesn't seem right. Good greyscale although. The CYP CRT should put out some good illumination like the FJP right? I'm checking tubes tomorrow.

[DaveWM]

if the HV looks right, the HOT and Shunt current look correct? I like to watch the HV while oberving scene changes to see how well the regulation is taking place. I also recall reading somewhere that defects in the video amp circuit can cause excessive beam current due to bias on the CRT cahodes being incorrect resulting in overloading of the HV circuit.

[old_tv_nut]

Originally Posted by DaveWM

if the HV looks right, the HOT and Shunt current look correct? I like to watch the HV while oberving scene changes to see how well the regulation is taking place. I also recall reading somewhere that defects in the video amp circuit can cause excessive beam current due to bias on the CRT cahodes being incorrect resulting in overloading of the HV circuit.

If the HV and regulator are OK, but the CRT draws too much beam current, you will SEE it go out of regulation (losing focus, and picture size changes)