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Thank you, gentlemen. Since I've already redone some of the previous repairs due to shorts and failed solder joints, I'll approach that first--redo all the modern caps and the electrolytics. Also the few resistors I've checked have drifted 10-25%, so I'll replace any that are off by 20% or more. That'll take me 1-2 weeks. I have a couple of spare 1B3's that test "good," so I can use those to rule out that cause. From the on-again/off-again picture and raster, an intermittent problem, like a bad tube socket or cold solder joint, is a likely suspect. I'll also look around for a kv meter.
And Don--Phil knows me better--you should understand that much of this is way over my head, This is first time I've confidently used the word "raster." For example, I have no idea what a bleeder circuit is, but instead of asking you, I'll take the time to figure it out on my own. That's the only way I can learn this stuff. I'm unteachable...but I can learn.
Thanks again,
Winky
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