[drh4683]

It looks like Wayne and I are both continuing with an on-going approach to CTC-5 troubleshooting.

I took voltage and resistance measurements around PW400 (luminance board) and found a few out of tolerance resistors, but nothing significant. They got replaced but I did not expect to see a cure to the lack of brightness cut off.

Needless to say, nothing changed. I'm really at a loss here as I'm showing proper voltages at the cathodes, grids and screens at the CRT. I noticed I had no control on the green background control but then discovered I have a loose tube socket for the G-Y demodulator. This may have been the cause of the green background control failing to work. I noticed I didn't have much green in the picture anyway. The chassis was on the bench when I made this discovery, so I've yet to test it, but I do read proper voltages on the grid leads when turning the background controls back and fourth. I switched demodulator tubes and a new tube made much better contact, almost like the pin diameters of the previous tube were slightly too small. Since I pulled the sheild off the chroma board, I took some resistance measurements for fun, everything seemed OK trying not to be fooled by resistors paralled over peaking coils.

This TV has been a challange to say the least. The contrast control has been left per the modification/change of the CTC-7 as it was when I got the set.
What else could I be missing here? Im so used to working on 60's sets like a CTC-38 chassis. The CTC-5 is a whole new situation! I thought hobbies were supposed to be relaxing (I wouldn't have it any other way I guess, I like a good challange)