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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

 
362_hl2_nvm.jpg

HL2
 

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