Color drives/biasing on '77-'80 Zeniths & '74-'75 Sonys...

[fxcamera1]

Originally Posted by dishdude

I think what you're asking is why do the red and blue guns get weak and the green usually stays strong?

That's always what I noticed.

You know, that thought occurred to me. But for 2 reasons I didn't assume that because 1) This old Sony seems to have an unnatural green brightness in the lower contrast areas of a given scene and in a subjects hair when compared to my newer Sony KV-20FV12 in the next room which has a much better greyscale balance when both are compared viewing an identical source, and 2) when I saw a certain youtube video the person described one gun having higher emissions due to a component issue. Does that sound logical? -But then again, different sets can have different issues.

[zeno]

Originally Posted by fxcamera1

You know, that thought occurred to me. But for 2 reasons I didn't assume that because 1) This old Sony seems to have an unnatural green brightness in the lower contrast areas of a given scene and in a subjects hair when compared to my newer Sony KV-20FV12 in the next room which has a much better greyscale balance when both are compared viewing an identical source, and 2) when I saw a certain youtube video the person described one gun having higher emissions due to a component issue. Does that sound logical? -But then again, different sets can have different issues.

The newer Sony has AKB ( automatic kine bias ) that adjusts itself.

On the Zenith do this.
Turn OFF the chromatic or color sentry if it has one.
Turn color down all the way.
Contrast or picture control to mid way.
Let warm up 1/2 hr.
Turn up the R & B a little to make the pix as B&W as you can.
The tube is aging so it may not be perfect.......
Return customer controls to normal & watch.

good luck
73 Zeno
LFOD !