Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
ID = 48705
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.
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)   

Prangnell-5Electrode: Wireless World
Roy Johnson



You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]