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The CTC-2B still isn't set up correctly. RCA specified an ultor voltage of 25 kV. Get your HV up and the picture should be brighter yet, even with a weak tube. 20 kV is barely acceptable for a 21AXP22.
Better yet would be to track down a better 21AXP22 and get the HV up, but that isn't going to be easy (or cheap).
As it stands right now, the CTC-7 looks to my eyes to have the superior image, even with the overscan.
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