Thank you all for the nice compliments and comments. I had tested the CRT last year when I got this set, but I did not know if it was going to be usable until I hooked up the chassis, but it is in pretty decent condition. Those pictures are with only minimal knob-twiddling after the restoration work I did on the chassis. Beside the good 15GP22, the happiest part for me is that the HV cage did not spark and arc all over the place after all the work I had to do in it.
Quote:
Originally Posted by miniman82
Nice work! Always nice to see another one resurrected from the grave. Looks like you have a bit of an overdrive line, does reducing the drive control make it go away? I had to change the value of a resistor in the drive circuit to get my drive line to go completely away, because it wasn't shunting enough of the signal to ground.
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Nick, the horizontal drive is set to minimum now; the drive line and non-linearity get worse if I increase it. The catch so far, though, is that my HV was about 17KV (adjustable downward only) before I reduced the drive, so now it is lower than that and the picture is dimmer and blooms even at relatively low contrast settings. I verified my coupling capacitor is .0015 (I just replaced it), so I need to check the values of resistors and other parts in the horizontal circuits (anything that I did not already replace) to look for most-likely causes of the low HV. This set started with a bunch of parts in the horizontal and HV circuits (all replaced in the past) that did not match the RCA or Sams schematics, so I replaced them all with the original values, but maybe those changes were done for a reason?
I wired the set in its original "early version" configuration (except that I made the change to allow a 6BK4 HV regulator), but I will probably go ahead and make the changes described by Pete Deksnis (and your HV-regulation mod) as well.