1965 Zenith Linearity Problem

[old_tv_nut]

Your pics of Archie Bunker and the Oreo are showing exactly opposite problems. Is the width or height (or their ratio) changing with picture brightness? Or different on different sources?

Edit: or did you adjust vertical controls between these two images?

[compucat]

No adjustments. The Oreo shows the real problem.

[old_tv_nut]

Originally Posted by compucat

No adjustments. The Oreo shows the real problem.

OK. Still asking if it changes with brightness (trying to guess if it could be a regulation problem). If it were my set, I would try replacing tubes in the H and V sweep and high voltage sections first before looking for other problems.

[jr_tech]

Originally Posted by compucat

No adjustments. The Oreo shows the real problem.

Can you adjust height and vertical linearity to make the Oreo more circular?

jr

[compucat]

Originally Posted by jr_tech

Can you adjust height and vertical linearity to make the Oreo more circular?

jr

Yes, and in doing so the picture has to be pulled in from the top and bottom about two inches.

[jr_tech]

Originally Posted by compucat

Yes, and in doing so the picture has to be pulled in from the top and bottom about two inches.

So your video source is "letterboxed" 16:9 format? Or perhaps 16:9 format squished to 4:3 (as some of the sub channels do)?
What is the source of the oreo picture ?

jr

[compucat]

Originally Posted by jr_tech

So your video source is "letterboxed" 16:9 format? Or perhaps 16:9 format squished to 4:3 (as some of the sub channels do)?
What is the source of the oreo picture ?

jr

The Oreo is from a commercial on Hulu. I have my Roku box set to 4:3 aspect ratio.