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THORPE K4, 1927
Helix wound anode valve. The Thorpe K4 was a tetrode of the space charge grid type. It was intended primarily for use in the Unidyne or Solodyne circuits which were popular at that time.
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The advantage of this valve was that no separate anode voltage supply was required, as both anode and inner grid were fed from the 6 volt filament battery. In the period 1925-1927 the K4 valve was offered for sale by at least three vendors in London, but although distributed by Bower Electric Ltd was not advertised by them.