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The 19V is closer to the 21AX. The 19V was the first tube to use photo deposition of phosphor dots directly to the inside face of the tube.
Kevin, Georgeous screen shot of your 21AX. I would want to save that tube too. The color saturation is fantastic. I hope my CTC4 looks that good when I get around to restoring it.
Bob
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Vacuum tubes are used in Wisconsin to help heat your house.
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