Quote:
Originally Posted by Olorin67
Despite the appearance of the mask, this unit has a round CRT. I found 1957 date codes on some of the tubes, so that might be the date, even though that is late for a round tube.
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For B&W monitors where the operator sat close to the screen, the 10 inch size was common in the 1950s, with the 10SP4 being popular. It was aluminized and that helped protect the operator's eyes from CRT radiation. This tube is directly interchangeable with the 10BP4 with a minor tweak of voltages.
The 10BP4 and 10BP4A were not aluminized, but the "A" had a grey faceplate to reduce reflections. (I've never seen a "B" or its specs.)
The 10BP4C and 10BP4D were aluminized, one with clear glass and one tinted gray.
GE built the monitors for a reasonable price. For industrial use, they would have used a mass produced tube instead of a specialty one, to save a buck. It would not surprise me if you find the tube is "factory rebuilt."
James