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SM1004

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ID = 11663
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  Dual-Grid Tetrode   Power/Output 
  Ca. 1925 up to 1945 very rare. ***
Identical to SM1004
Similar Tubes
Normally replaceable-slightly different:
  PP416

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Foo) Sidecontact
Filament Vf 4 Volts / If 0.15 Ampere / Direct / Series, DC
Description Tungsram and Radio Record made tetrodes with penthode characteristics to avoid the Philips penthode patent. 
Text in other languages (may differ)
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   
 
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SM1004
Peter den Boer

 
sm1004.png
SM1004: own collection
Peter den Boer


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