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According to my Sylvania Tube service manual(1951):
Metal Cone lip contact
Deflection angle : 70 degrees
Requireds focus coil and single maginet ION Trap.
16GP4g is an all glass version
16GP4A has a clear faceplate
16GP4B has a frosted faceplate
I can e-mail you a scan of al the specs if necessary.
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Jordan
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