Diagram showing the elements of a three-electrode valve, with their symbolic equivalents.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310724.2.32.2
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Radio Record, Volume V, Issue 2, 24 July 1931, Page 14
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12Diagram showing the elements of a three-electrode valve, with their symbolic equivalents. Radio Record, Volume V, Issue 2, 24 July 1931, Page 14
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