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ID = 20446
United States of America (USA)
Brand: Common type USA tube/semicond.
Tube type:  HEPTODE 
Identical to 6687 = E91H
Similar Tubes
Normally replaceable-slightly different:
  1680 ; 2032 ; 5915 ; EH900S ; EH960
Other class quality (otherwise equal):
First Source (s)
23.Jul.1956 : Electron Tube Registration List
Predecessor Tubes 5915   EH900S  

Filament Vf 6.3 Volts / If 0.27 Ampere / Indirect / Specified voltage AC/DC
Description Designed as logic switching tube: both control grids at 0 V = tube conducts, control grid #1 OR control grid #3 at negative voltage: tube blocked. _ [JR] 
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eh900s_sock~~4.png 6687: Telefunken Taschenbuch 1971
Anonymous 15 Collector

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6687: VALVO-Handbuch 1966
Oskar Elm

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