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Prangnell-5Electrode

Information - Help 
ID = 48705
       
Country:
Great Britain (UK)
Brand: Unknown - CUSTOM BUILT: GB
Tube type:  Double Triode 
  <1925 no serial production. For instance only development samples. *****
Identical to Prangnell-5Electrode
First Source (s)
24.Jun.1922 : Wireless World (The), London (WW, 79) p377

Base Other combinations of connections.
Filament
Description Announced as a Five-Electrode Tube in 1922 by J P Prangnell who designed it and had it manufactured. Two forms of the tube were made.

It has a filament, two grids and two anodes and appears to be effectively a double triode.

An experimental receiver circuit uses this tube for note amplification; it is a transformer coupled arrangement with positive feedback controlled by grid bias so that the output stage is on the point of oscillation. Reception of a signal causes the oscillations to start or cease - effectively acting as a switch. 

Information source Wireless World (The), London (WW, 79)   

fiveelectrode1922_cct.gif
Prangnell-5Electrode: Wireless World
Roy Johnson

 
prangnell_5electrode_a.jpg

Prangnell-5Electrode
 

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