ok decided to check into the hue issue, 1st check some caps and resistors around the phase detector, all good. I had the set on its side and was going to tweek the burst amp coil to see if I could get better hue range. so I had it on its side, powered up, no pic, I hear static, I look at the back and I see sparking at the filaments
I have no idea what happened, I layed it on its side very gently, no bumps etc.. I check the CRT with a CRT tester, I see one filament glow weakly them more sparks then nothing.
filament pins read 30k I tried checking the even went so far as to try to resolder, no joy, break away the socket to get at the filament wires, nothing.
I tap around the neck (not hard) and I see a crack around the neck. I hear nothing at all, on air leakage etc, and it is an open crack (I can lift the neck off). So somehow it was either cracked and gone to air, or had gone to air and then I cracked it. My guess is it had gone to air before I cracked it, the filaments just burned out, otherwiise I am sure I would have heard something.
Anyway the CRT was very weak, took a good 5 min to produce a decent pic.
I had a spare CRT that I had planned for another project, but since it was no where near being ready (a CTC 7 with a very ruff chassis, may be a lost cause anyway) I decided to go ahead and use it. It the kind with the separate lens (no cat to deal with
) after struggling with it for about 1 hour I managed to get it all in an buttoned up. I touched up the purity and did a real quick static convergence (on over the air broadcasting not the dot bar gen) just to get it in the ball park. I have some vert bars on the left so I will need to look into the HOT/Damper and will recheck all the setups, did a quick gray scale setup. it looks very good, the pic quality and brightness are much much better and the pic is good to go in about 30 sec vs the old CRT 5 minute deal.
Not sure what happened but all ended well. I will get some more screen shots later after I take the time to do a proper setup.
something I have not seen before, the brightness seems a little greater on the top of the pic than on the bottom, maybe its just a linearity setting but I seem to recall reading about this kind of issue and diodes in the blanking circuit but not sure about that.
My guess is the better CRT is allowing defect to be more noticable now.