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About a year or two ago I met a man who said he has a metal cone color tube...
so I suspect it must be a 21AX. He has a radio repair shop close to Fort Lauderdale. He seemed to be the sort that would be very difficult to deal with but I have been wrong many times before. So, I suspect others wil have one but I would try to find him again if anybody would like me to do so.
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