Antique radios, Old Time Radios

HL2

Country:	Great Britain (UK)		Brand:	Common production Great Britain valve / tube
			Tube type:	Triode, vacuum Universal

Tube ID = 2904

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Identical to	HL2 = VR27_2Volt = CV2991
Similar Tubes	Other class quality (otherwise equal): CV1436

Base	Europe 4-Pin (A, 4A, B4, since 1914) (Codex=Eo)
Filament	Vf 2 Volts / If: 0.1 Ampere / -: Direct / -: Battery = /
Description	Known Manufacturers:- Marconi; Mazda. Sizes vary.
Literature	Taschenbuch zum Röhren-Codex 1948/49

HL2
Rudolf Osterkamp

HL2: Telefunken Werkstattbuch
Wolfgang Bauer

HL2: osram wireless guide 1931
Giuseppe Antonio Tusini

Usage in Models	1= 1928 ; 1= 1929 ; 8= 1932 ; 10= 1933 ; 9= 1934 ; 3= 1935 ; 1= 1936?? ; 3= 1936? ; 5= 1936 ; 1= 1937? ; 6= 1937 ; 1= 1938?? ; 1= 1938? ; 5= 1938
Number of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe): 55

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