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When the 23EGP22 entered production, Corning Glass, then the US source for CRT envelopes, did not yet offer a rectangular color envelope. National Video engineers built the 23EGP22 using what had been intended to be a black and white envelope.
The 2EGP22 offers strong proof of this fact in that its 2nd anode connector is at the side of the funnel, while the later rectangular color tubes have the 2nd anode connector at the top center of the CRT envelope's funnel.
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