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ID = 20602
Brand: Radio-Record - Röhrenmarke; Holland
Tube type:  Screen-grid Tetrode   Power/Output 
Identical to M1004X
Similar Tubes
Other base and data slightly different:
First Source (s)
1927 : Saga of the Vacuumtube, Tyne p.427

Base Europe 4-Pin (A, 4A, B4, since 1914) Sidecontact
Filament Direct / Parallel, (AC/DC)
Description Siehe "Radios von gestern" Seite 228. 

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