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ID = 22691
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to D2 = PR12_Condor = D-II_Ideezet = PR12_Pope = DHV_Ideezet = D-II
Similar Tubes
Other base:
  D-V ; D2_Y ; D5_Philips
First Source (s)
05.Mar.1926 : Radio Luistergids, The Netherlands The D2 is still available.
Production stop 1927

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 3.5 Volts / If 0.5 Ampere / Direct / Battery =

Uf=3,5VDC, If=0,5A, Ua=30-75V. In 1925 und 1926 Ua = 40-100V. Röhren mit dem Aufdruck "Serie" sind zur Heizung mit einem Eisen-Serienwiderstand für 6V-Batterie vorgesehen. Die gleiche Röhre heisst in 1921 biss 1925 D II bzw., zeigt also eine römische Nummer (ohne Bindestrich).

Dimensions (WHD)
incl. pins / tip
30 x 93 x 28 mm / 1.18 x 3.66 x 1.10 inch
Weight 32 g / 1.13 oz
Information source Saga of the Vacuum Tube, Tyne   p.416
- - Manufacturers Literature   1920

b4direct_2.png D2
Peter den Boer

Just Qvigstad
D2: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

More ...
Usage in Models 3= 1923 ; 2= 1924 ; 2= 1925

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):7

Collection of




In 1926 the D2 had a bakelite base.

In 1925 the D2 was tipless

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