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Back in business!
Thanks everyone! Damen you nailed it. Q703 was shorted across emitter & collector. The number on the transistor is 3474, and I have a CTC169 chassis in my junk box that had a couple of them, so I didn't even have to get the NTE159.
The picture has a green tint again, so I'm going to let it run for a few hours, and if it doesn't arc again & the crt holds up, I'll set the gray scale again and try to take a good picture. I'm hoping the tube stabilizes after it runs awhile.
Zeno - I don't see jail bars in the picture so I think it's the camera doing it.
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