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6687

Information - Help 
ID = 20446
       
Country:
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 ; 6BY6 ; EH900S ; EH960
First Source (s)
23.Jul.1956 : Electron Tube Registration List
Predecessor Tubes 5915   EH900S  

Filament Vf 6.3 Volts / If 0.27 Ampere / Indirect / Parallel, (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] 
Text in other languages (may differ)
Tube prices 1 Tube prices (visible for members only)
 
6687pix.jpg
6687: Amperex 6687 Holland
John Albion

 
eh900s_sock~~4.png
6687: Telefunken Taschenbuch 1971
Anonymous 15 Collector

 
6687_1.png
6687: VALVO-Handbuch 1966
Oskar Elm



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