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It's not a problem of general blooming, where the whole screen just expands, blurs up etc. My CTC-5 will do that just cranking the bright too high. On the 16, it's just the 'highlights', like pure bright white letters on a blank screen
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Thats where I would expect it to happen. The regulation Andy is referring to goes on dynamically as the beam scans a line across the screen. On the black parts of the scan line, the 6bk4 is drawing a bunch of current, and the CRT is drawing not much. On the white parts, the 6bk4 is drawing little current, and the CRT a bunch. The total current is about constant. If part of the line is "too white", the crt by itself will draw more than the normal total current. The high voltage goes down, and the CRT goes out of focus. as soon as the line is back to white, grey or black, normal regulation resumes.
If you set both sets up for maximum difference between white and black without any blooming anywhere in the picture, does the ctc5 do better?
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One more question - the 'kine gain' switch. If I can get a decent picture with this at it's lowest setting ('up' position) and brightness on full, would this be good for the life of the tube vs. the next switch setting and turning the brightness down?
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I dont know, but the higher the brightness control is with a normal picture, the more DC restoration you get. IMHO these sets never had enough.
jc