Antique radios, Old Time Radios
Prangnell-5Electrode
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Country:
Great Britain (UK)
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Brand:
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Unknown - CUSTOM BUILT: GB |
| Tube type: |
Double Triode |
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<1925 no serial production. For instance only
development samples. ***** |
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| Identical to |
Prangnell-5Electrode
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| First Source
(s) |
24.Jun.1922 : Wireless World (The), London (WW, 79) p377
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| Base |
Other combinations of connections.
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| Filament |
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| 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.
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| Information source |
Wireless World (The), London (WW, 79)
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Prangnell-5Electrode: Wireless World
Roy Johnson
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