3” Image Orthicon
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Developed
at RCA in the early and mid-forties, by Albert Rose, Paul Weiner and Harold
Law, initially for military use, the Image Orthicon entered the civilian
television market in 1946, and, with its great sensitivity mainly due to its
five stage photo-multiplier, and its very good definition it was soon
universally adopted as the standard pick-up tube in black and white TV
cameras and stayed in use until the late sixties when it was progressively
replaced by the less bulky Vidicon and Plumbicon tubes. With
the high demand, soon Image Orthicon tubes were built, sometimes with
slightly different specifications and construction details, by several manufacturers
on both sides of the
The Image Orthicon, which boasted being able to take good pictures even
in candle light, was often referred to as the “I.O.”. It cost then some
$1500, and its useful life was about 600 hours.
Note, in the x-ray view, the “empty” space in the middle part of the
tube. That’s where the electron flow is controlled by the surrounding coils. |
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