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M1004

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ID = 12799
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  Screen-grid Tetrode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to M1004
Similar Tubes
Normally replaceable-slightly different:
  B443 ; L506 ; PP415 ; RES164d
First Source (s)
1930 : Radio-Expres, Netherlands
Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fo)
Filament Vf 4 Volts / If 0.22 Ampere / Direct / Battery =
Description

Gm=1.2 at Va=200, Amplification factor 200. (Radio-Expres 1930). To avoid the Philips patent of the penthode, Tungsram and Radio-Record made tetrode's with a penthode characteristic, This is neither a screen grid tetrode, nor a penthode. See base diagram. Also made with B4 base with sidecontact.

 
Dimensions (WHD)
incl. pins / tip		 45 x 114 x 34 mm / 1.77 x 4.49 x 1.34 inch
Weight 40 g / 1.41 oz
Information source Taschenbuch zum Röhren-Codex 1948/49   
Radio-Expres, Netherlands   
- - Manufacturers Literature
m1004_sock.png M1004: Tabu Röhren-Codex, 1948
Anonymous 15 Collector
More ...
Just Qvigstad 		m1004data.png
M1004: own collection
Peter den Boer

Collection of

Karl - Heinz Bossan (D)
Peter den Boer (NL)
 
m1004_radio_record.jpg

M1004
 
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