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ID = 51591
Brand: Longlife, the Hague
Tube type:  Double Diode 
  Ca. 1925 up to 1945 rare.
Identical to DD
Similar Tubes
Normally replaceable-slightly different:
  AB1 ; D-III ; D3 ; NERAS
Production stop Nov.1934
Predecessor Tubes NERAS  

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Filament Vf 4 Volts / If 0.65 Ampere / Indirect
Description When Longlife became a Philips licence in November 1934, this tube was re-designated into AB1. 
Information source Radio-Expres, Netherlands   7-9-1934
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eu11~~2.png DD: RTT 1974 (Franzis)
Martin Renz

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