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ID = 57827
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes 
  Ca. 1925 up to 1945 rare.
Identical to 300_Radio-Record = DM300_old
First Source (s)
1926 : - - Manufacturers Literature

Description Probably there is a typing error in the german advertisement. The tube should be a DM300. 
Text in other languages (may differ)
Information source - - Manufacturers Literature   Werbung 1926

300_Radio-Record: Bloch, W., Radiotechnik II, 1926
Anonymous 15 Collector


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