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ID = 47997
United States of America (USA)
Brand: Raytheon Mfg. Co.; Cambridge, MA
Tube type:  COUNTING AND MEASUREMENT, general 
Identical to CK6910 = 6910
Similar Tubes
Other base and data slightly different:
  6476 ; CK6476

Base Duodecal 12 pin plus base cap B12E
Filament No heater

High-speed 100k pps max, bidirectional decade counter and selector. Mechanically similar to 6476. 11-pin base with additional center contact.
Raytheon proprietary code for 6910.

Information source - - Manufacturers Literature   
Tube Lore (I)   
  CK6910: DataSheet
Franz Scharner
    More ...
CK6910: coleccion privada
Alberto Sanna-Alonso

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CK6910: Raytheon Technical Data Sheet
Franz Scharner

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