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ID = 51140
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Tube type:  Photomultiplier 
Identical to 7102

Filament --/--

Ten-stage, head-on, flat-faceplate type having S-1 response. Wavelength of maximum spectral response is 8000 +/- 1000 angstroms. Makes use of silver-magnesium dynodes and a flat-circular, silver-oxygen-cesium, semi-transparent photocathode. (May also be ordered with copper-beryllium dynodes). Window material is Corning No. 0080 lime glass or equivalent. Has a non-hygroscopic base. 

Dimensions (WHD)
incl. pins / tip
40 x 116 x mm / 1.57 x 4.57 x inch
Weight 57 g / 2.01 oz
Information source - - Manufacturers Literature   RCA Phototubes and Photocells PT-60

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