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Old 09-11-2017, 04:41 PM
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old_tv_nut old_tv_nut is offline
See yourself on Color TV!
 
Join Date: Jul 2004
Location: Rancho Sahuarita
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A great nostalgia piece.

You are right, the tube would be 19 inch diagonal, which was the largest that would fit into a 19 inch wide rack mount. As for color, the tubes were made with calibrated phosphors, which had accurate colors, but no more color gamut than a current HDTV set. A lot of the picture quality came from having perfectly stable black level plus stable high voltage and therefore perfectly steady scan with no "breathing" whatsoever with video content. IIRC, these sets had separate horizontal sweep and high voltage supply circuits. The contrast capability was less than current LCD displays, depending on the amount of room lighting reflecting from the CRT face. Some additional image quality was due to the phase-linear video peaking circuitry, too expensive for consumer sets until digital video processing came along. These monitors, however, did not have comb filters, and therefore suffered some loss of resolution due to the chroma subcarrier trap, which could be switched off for monochrome use.
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