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HL21DD

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ID = 14310
       
Country:
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to HL21DD = VR44 = CV1044 = HD24

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fp) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.15 Ampere / Direct / Battery =
Information source History of the British Radio Valve to 1940   p. 140 & 166
Babani, International Radio Tube Encyclopaedia   p. 110 & 111
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

128_3.png HL21DD: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
hl21dd_l2dd_l21dd.png
HL21DD: own collection
Peter den Boer

Usage in Models 1= 1934 ; 2= 1935 ; 3= 1936 ; 2= 1937 ; 3= 1938

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):11

Collection of

 
5b91b08c_4014_46ec_ae78_94c4902a6589.jpeg

HL21DD
 

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