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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Pete, do I understand this article correctly that RCA developed 90 degree, 21 roundie? Was the neck the size of a 70 degree roundie or the smaller neck of a typical 90 degree rectangular CRT?