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ID = 29165
Brand: Common type Worldwide tube/semicond.
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Photomultiplier 
Identical to 931A = 27M1 = CV337 = GL931A
Similar Tubes
Normally replaceable-slightly different:
  931VA ; CV2696
First Source (s)
01.Sep.1950 : - - Manufacturers Literature
01.Dec.1943 : -- Original-techn. papers. Lab results

Base Sub-Magnal 11 pin
Was used by Technology / Measurement

Nine-stage photomultiplier, side-on type having S-4 response. Wavelength of maximum response is 4000 +/- 500 angstroms. This type makes use of cesium-antimony dynodes and a cesium-antimony, opaque photocathode. Window material is Corning No. 0080 lime glass or equivalent. Has a non-hygroscopic base. 11pin Sub Magnal base.

Dimensions (WHD)
incl. pins / tip
33 x 94 x mm / 1.30 x 3.70 x inch
Tube prices 3 Tube prices (visible for members only)

931A: de oude delft, optische Industrie, PHT-7, Nr.3TC1635,9
Jörg Sigg

27m1_so_2.png 931A: Original data sheet
Anonymous 10 Collector

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Just Qvigstad
931A: Firmeninfo
Anonymous 15 Collector

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Usage in Models 1= 1957 ; 1= 1960 ; 1= 1963?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

Collection of

Documents about this component
  931A photomultiplier: A very early application of 931A in an optical scanner with character recognition capabilities. From Electronics, May 1955. 1403 KB


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