Quote:
Originally Posted by old_coot88
Does the overall raster size appear to 'breathe' or 'bloom' during the fade-to-nearly-black interval?
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No, not really blooming as I have seen many times; simply fading to black and then it comes back. Now I can say that recently (probably said before) the picture is out of focus when it is there and appears to be bloomed with the top few inches cut off.
Somehow I think a lot of this may tie in with that hissing in the HV cage because it stops sometimes and things are a lot better, but I have had a much better display in the past even with the hissing which only seemed to cause a bit of distortion on the picture and a faint Barkhausen line to the left.
What throws me off is that no matter what I can go to any unused channel and the raster is bright and full with only a hint of the HV distortion when you look real close. That's what I just don't get. I powered the set today in a dark room and noticed a fairly bright blue glow inside the HV rectifier. I'm not sure if that is normal or not. I was thinking that HV rectifiers are normally just dark for the most part. Perhaps the rectifier tube is the problem. I have tested it, but not swapped it. And as we all know tube testers are not testing under real world conditions by any stretch.
Thanks for keeping up on this. I don't have time for a full restoration job and with most all other circuits working well, I don't think that an initial repair of the set is way out of line. If it were a 40s or early 50s set certainly, but these 60s sets can go with a little help in many cases.