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77_G&R

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ID = 56444
       
Country:
Australia
Brand: G and R Electrical Co. Sydney, NSW
Developer: G and R Electrical Co. Sydney, NSW 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to 77_G&R
First Source (s)
02.Nov.1923 : -- Original-techn. papers.

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Direct / Battery =
Description This was invented and patented in Australia on November 2,1923. The basis of the patent was that all four "leading-in" wires, from the base were terminated in metal tubes sealed into the "press". The opposite ends of the tubes held the filament, anode and grid wires respectively and these were made of sturdy wire. The object of the patent was to have a rigid element assembly inside the finished tubewere 
Dimensions (WHD)
incl. pins / tip
x 120 x 25 mm / x 4.72 x 0.98 inch
Weight 44 g / 1.55 oz
Information source 70 Years of Radiotubes and V.   Page 189
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77_g_r.jpg
77_G&R: Fin Stewart collection
Fin Stewart

 
b4_1~~73.png
77_G&R: Fin Stewart
Fin Stewart

 

from Just Qvigstad


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