1960s Sylvania Color TV Console Issues

[vortalexfan]

Originally Posted by Kevin Kuehn

You are correct. The 3 position switch simply selects which color gun you're testing. So you need to re-set the cutoff control for each gun when you move between the 3, because there's no memory of the 3 cutoff settings. Some fancier testers have 3 separate cutoff controls and 3 meters so you can compare all 3 color guns simultaneously.

That's what I thought but when I would go to adjust the red color gun settings and do an emissions test on the red color gun in my picture tube I get no needle deflection/movement from the meter but when I would test the green and blue color guns in my picture tube I get deflection/movement meter that shows that the picture tube is still good yet, but how is it possible for a picture tube to have really good testing green and blue color guns but a dead testing red gun?