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ID = 13721
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Triode, vacuum   Audio Frequency 
Identical to AC2HL
Similar Tubes
Normally replaceable-slightly different:
  41MH ; 4DXAC ; 904V ; A30B ; MH41
Other class quality (otherwise equal):
  CV2806 ; CV2807
Other characteristic (electr. data):

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Va <200; Typ:- Va=100; Vg=0; gm=6.5 Ra= 11500 (Mazda data book)
Available in metallised and un-metallised versions.

Information source History of the British Radio Valve to 1940   p. 139 & 178
- - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49

7_48.png AC2HL: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
AC2HL: own collection
Peter den Boer

Usage in Models 2= 1931? ; 2= 1931 ; 1= 1932? ; 8= 1932 ; 1= 1934? ; 1= 1934 ; 1= 1938?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):16

Collection of



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