Zenith with jaundice

[bgadow]

I decided it was about time to tear into my Zenith 25MC33 roundie. This set was given to me by a used furniture store in WV back a few years ago. It only needed a focus rectifier & a tweak of the height control to give a good picture. The recent talk of tuner rebuilders set me to action because neither this nor the 25MC30 I have would work right on UHF. I pulled them both apart & I don't think the 33 was anything more than loose connections because now its behaving.

But, it has another problem that maybe somebody can help me with. The raster has a yellowish cast. I cannot adjust it out using any controls. Its not real bad but I would rather it was gone. I read in the RCA Color Pict-o-Guide that this can be caused by a bad cap between the color difference amp & b/y amp but that is for RCA & this circuit is different. I did change out a cap in a similiar part of the Zenith's circuit (a ceramic disc that was fat & cracked) but that didn't help. I also swapped the demodulators & the 2nd chroma/bandpass/killer tubes.

Has anyone run into this before on a Zenith? Other than that the set works well; great sound, power tuning, plus a nice cabinet.