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AC/HLDD

Information - Help 
ID = 29341
       
Country:
Great Britain (UK)
Brand:
Developer: Hivac Ltd.; Harrow-on-the-Hill 
Tube type:  Double Diode-Triode   Audio Frequency 
Identical to AC/HLDD
Similar Tubes
Normally replaceable-slightly different:
  H4D
Base British-7-Pin, old (M7A) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Description

Va<250; Ra=13.8k, gm=2.6mA/V; G=36 at Va=100, -Vg=0.

 
Dimensions (WHD)
incl. pins / tip		 45 x 125 x mm / 1.77 x 4.92 x inch
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 292, p. 656
History of the British Radio Valve to 1940   p. 139 & 179
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49
ac.hldd.png
AC/HLDD: Propia
Santiago Lopez Perez
mazda_ac_hldd_socket.gif AC/HLDD: Mazda DataSheet
Franz Scharner

Just Qvigstad 		mazda_ac_hldd_datasheet.gif
AC/HLDD: Mazda DataSheet
Franz Scharner
More ...
Usage in Models 2= 1933? ; 4= 1933 ; 3= 1934? ; 6= 1934 ; 1= 1935? ; 2= 1935 ; 4= 1936 ; 5= 1937 ; 1= 1938? ; 4= 1938
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):32

Collection of

Robert Gillespie (USA)
Pedro Prieto-Castro (E)
Bart Slager (F)
 
e_mazda_ac_hl_dd.jpg

AC/HLDD
 
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