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HL2

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ID = 2904
       
Country:
Great Britain (UK)
Brand:
Developer: Marconi-Osram - (Valves/Tubes); GB 
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 rare.
Identical to HL2 = VR27_2Volt = CV2991 = VT105_GPO = CV1673
Similar Tubes
Other class quality (otherwise equal):
  CV1436
Multiple differences or of other kind:
  HL2_UV

Base Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Description

Known Manufacturers:- Marconi; Mazda UK. Sizes vary. Also made by MOV with nickel plated "Shaw" base, c. 1930. Used as a detector and low frequency amplifier tube. Rigid element construction enables this tube to eliminate microphonic interference. Available with plain or metallised bulb.

 
Literature Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature
 
hl2_3.jpg
HL2
Rudolf Osterkamp

 
1_254.png
HL2: Telefunken Werkstattbuch
Wolfgang Bauer

 
h.l.2_osram.png
HL2: osram wireless guide 1931
Giuseppe Antonio Tusini


Usage in Models 1= 1928 ; 3= 1929 ; 2= 1930?? ; 1= 1930? ; 1= 1930 ; 1= 1931 ; 13= 1932 ; 12= 1933 ; 2= 1934?? ; 1= 1934? ; 17= 1934 ; 1= 1935?? ; 1= 1935? ; 3= 1935 ; 1= 1936?? ; 3= 1936? ; 5= 1936 ; 1= 1937?? ; 2= 1937? ; 6= 1937 ; 1= 1938?? ; 1= 1938? ; 7= 1938 ; 1= 1939

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):87


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