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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
Other base:
  HL2_UX
Multiple differences or of other kind:
  HL2_UV
Base Europe 4-Pin B4 (Eu A, E, 4A) 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.

 
Dimensions (WHD)
incl. pins / tip		 x 88 x 28 mm / x 3.46 x 1.10 inch
Weight 25 g / 0.88 oz
Information source History of the British Radio Valve to 1940   p. 140 & 166
Babani, International Radio Tube Encyclopaedia   p. 108 & 109
Taschenbuch zum Röhren-Codex 1948/49
- - Manufacturers Literature
1_254.png HL2: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad 		h.l.2_osram.png
HL2: osram wireless guide 1931
Giuseppe Antonio Tusini
More ...
Usage in Models 1= 1927 ; 1= 1928 ; 3= 1929 ; 2= 1930?? ; 1= 1930? ; 1= 1930 ; 1= 1931?? ; 2= 1931 ; 13= 1932 ; 13= 1933 ; 2= 1934?? ; 2= 1934? ; 19= 1934 ; 2= 1935? ; 3= 1935 ; 1= 1936?? ; 3= 1936? ; 4= 1936 ; 2= 1937? ; 6= 1937 ; 1= 1938?? ; 2= 1938? ; 7= 1938 ; 1= 1939 ; 1= 1940
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):94

Collection of

Marcelino Iniesta Fernandez (E)
Gwyn Griffiths (GB)
Raynal Aufils (F)
Lindsay Shepherd (AUS)
Bjarne Jensen (DK)
Rudolf Osterkamp (D)
John Koster (NL)
Patrice Zeissloff (F)
Fin Stewart (AUS)
 
362_hl2_nvm.jpg

HL2
 
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