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GR720/DA

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ID = 30149
       
Country:
Germany
Brand: Deutsche Glimmlampen GmbH, (DGL), Otto Pressler; Leipzig
Tube type:  Voltage Regulator, single 
Identical to GR720/DA
Similar Tubes
Other base:
  GR720/DR
Multiple differences or of other kind:
  GR720 ; GR720/A

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 494

gr420dr_sock~~4.png GR720/DA: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

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