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Originally Posted by Adam
Adjusting the screen controls, the voltage there varies between 400 and 1000 volts on all 3 guns. Seems ok. An unhappy development, I tested the crt again, 3 months ago the green and blue guns read 3/4 of the way up the meter and the red 1/2, now the green and blue are the same, but the red only 1/4.
I'm still worried about my red gun, but at least I found what seems to be the problem, the grids are all off, green = 400v, blue =100v, red = 50v. They're supposed to be 160v.
Plate voltage is 300v on all guns (it says it should be 345v), I wouldn't think this is a serious problem.
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I was just looking at the schematic and the grids are fed with the 405v tap, through the 22k plate resistors for the r-y, g-y, & b-y amps. For the green grid to be at 400v, the plate of the g-y (6gu7) amp would have to be up there too. The plate must not be drawing any current. Could that tube be bad?