Well, 'tis a puzzlement to me. The only thing I see near the switch (which opens B+ to the bandpass amp) is a 6800 ohm and 0.1 uF bypass. It's a wild guess, but you might check those. Also make sure the grounds on the chroma board are solid.
Everything else in the chroma section is running with chroma on or off, so it's hard to see how it could be there. |
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I was wrong...
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Trying to figure out what could couple something at that frequency to the CRT.
Some straws to grasp at: Does it change when you adjust the color killer control? Maybe check the caps (especially .01 or larger) and other stuff in the color killer section? |
Killer control has no effect. All caps on the chroma board have been replaced so I dont think it is that..
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Well, I'm stumped. I don't mean to be insulting, but have you double checked the values of the bypass capacitors? Other than that, it's time to put a scope on the CRT leads, and if you can see it, trace it back to the source.
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Of course, any modification is suspect, but how in the world would it come and go with the color switch?
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