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DuMont 12 1/2 Industrial Color Monitor

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Technical information

DuMont made this monitor for its industrial closed circuit system. It was demonstrated at the 1950 IRE show. The monitor is now at the museum, and we intend to restore it and display the high quality 500 line resolution color pictures it can produce.

The monitor is mostly complete, but is missing the motor control chassis. It even has its original knobs. Cliff Benham has built a new color wheel and a motor control chassis, and the monitor now works. Follow our restoration of the monitor here.

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Viewing area. There is no magnifier, but some sort of goop on it.

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HV and horizontal sweep chassis

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Vertical sweep and video chassis

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Power supply chassis

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CRT cover and motor assembly

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With the CRT cover removed, showing the color wheel

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Metal tag, which can be seen in the picture above at the center bottom. Does USN mean the U. S. Navy?

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The color wheel assembly, rear

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Color wheel assembly, front. The goop is from the rubber pieces that go between the assembly and the CRT frame

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Glass from the front of the color wheel assembly

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The CRT cover, containing the yoke and focus coil. It is similar to the one in the Gray Research monitor, but for a 12 inch tube, probably a 12JKP4 or 12QP4.

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The color wheel. It is made of two sheets of plastic, with filter material sandwiched between. The sheets are riveted together.

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Rivets for balancing the wheel

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Cliff Benham with the monitor

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The monitor, restored, with Cliff Benham's motor control chassis

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Courtesy of John Folsom

A picture from the screen after restoration