The innards of an indirectly-heated A.C. valve. The thick piece of metal that can be seen passing through the centre of the grid is the cathode.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290920.2.77.1
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Radio Record, Volume III, Issue 10, 20 September 1929, Page 41
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26The innards of an indirectly-heated A.C. valve. The thick piece of metal that can be seen passing through the centre of the grid is the cathode. Radio Record, Volume III, Issue 10, 20 September 1929, Page 41
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