Quote:
Originally Posted by miniman82
BTW, I found out what happens if the HV regulator becomes defunct: a whole lotta nothin'. HV jumps up to like 27k, but nothing that would stand out at get your attention. It happened when the current meter came off the 6BK4, just like I said it would. lol
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Usually, variations in the very high voltage on a CRT makes the size of the raster change. Higher voltage makes a smaller picture, as the higher voltage is pulling on the electrons harder. Changes in the picture content in a set with DC restore will change the current draw on the flyback, brighter makes the voltage sag and the picture will get a little bigger. B&W sets usually did not have DC restore, when the TV show showed a night scene, the blacks would get gray. And the grays would get blacker if it was a sunny day in the TV show, so the current draw was fairly constant and thus the picture size stayed pretty much the same. But no DC restore looks crappy on a color set, so they put it in, and then the need to regulate the HV shows up.