Standard thermionic valve

1930s in England

Standard Telephones and Cables Limited thermionic valve From National Valve Museum:

The 4304CB transmitting valve has a directly heated thoriated tungsten filament. The electrodes are sealed into a glass pinch.The anode is of carbon and can dissipate 50 Watts. The high operating voltage leads to the placing of the anode connection on the top cap. The grid is moved to a top cap connection in order to allow the valve to operate at high frequency.The valve was used as a power oscillator as well as a power amplifier and in pulse mode for early 200 MHz radar.


Radio Communication
Object Number:
glass, metal (unknown), plastic (unidentified)
thermionic valve
  • component - object
Gift of Dr. G. R. Airth

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