Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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Neat stamps! The tube does not look like a 15GP22... Check my avatar, the phosphor was deposited on a flat plate and surrounded by a mask inside the envelope. I see no such detail in the cool photo.
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