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I've found that the 17, 20, and 21 inch tubes that specify a minimum ultor voltage will usually work WELL below the minimum recommended; a slight twist of the brightness control will usually suffice. Hell, my Philco 48-1000 refuses to put out more than about 6.5 kV, but the 10BP4 in it still shows a nice watchable, if not terribly bright, picture.
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