I wonder if it would be possible to modify the video output circuit to eliminate the bleeding in a TV with a weak CRT thats not too far gone to be usable?
(From: Michael.) I plan to try this in the next month or so. If I have any luck, I will post the results. In order to do this, voltages are gonna have to climb to keep that transistor out of saturation. This is going to result in more heat. Could it be possible that energy conservation mandates from the government resulted in flaring? If so, the same thing that causes my CRTs to flare also causes my toilet and shower to lose power. From the point of view of the cathode, the CRT is a current controlled device like a BJT. From the point of view of the grid, it is a voltage controlled device, like a MOSFET. I can’t remember why the video drive is applied to the cathodes rather than the grids, but I know there was/is a good reason. So, barring a radical change, such as CRT grid drive, I think we want to use BJTs, but we need total control over Ik, regardless of how Mr. CRT feels. So, we would drive the CRT cathode with the NPN BJT collector, and have a fairly large Vce – which implies a bi
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