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Saw this thread while Google searching the Chromatron.
Sony actually marketed a 61/2 inch color hybrid Chromatron for approximately 3 months starting July, 1968 and quickly replaced it with the first Trinitron in the US. In October, 1968.
The Chromatron was model KV 7010U and the Trintron was the model KV 7010UA.
The KV 7010U used a 3 gun inline system like the Trinitron, but instead of the Aperture grill, they used a fine wire color selection grid similar to the Original Chromatron with post acceleration, two high voltage power supplies with 3 connections to the CRT bell. Inside the set there is a label attached to the CRT, it recites "Sony Chromatron licensed under Patents of Paramount Pictures Corporation.
So the Chromatron did not die in Japan, it made it to our shores for a brief period in time with very low production numbers.
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