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HLA1

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ID = 25934
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Triode, vacuum   Detector 
  Ca. 1925 up to 1945 rare.
Identical to HLA1
First year Aug.1932 - - Data from my own collection
First Source (s)
Aug.1932 : The Wireless World, London (WW, 79) p168

Base Europe 5-Pin (O5A, B5)
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
Description Micromesh Tube. High slope detector gm 8mA/V In the books History of the British Radio Valve to 1940, Thrower and the book 70 Years 0r Radio Tubes and Valves, Stokes, is a slope listed of 12 mA/V. 
Dimensions (WHD)
incl. pins / tip
56 x 110 x 34 mm / 2.20 x 4.33 x 1.34 inch
Weight 56 g / 1.98 oz
Literature
 
hla1.jpg
HLA1
Peter den Boer

 
hla1_so.png
HLA1: rtt
Michael Schlör

 

Usage in Models 2= 1931? ; 1= 1932 ; 1= 1933

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):4


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