This sketch shows the internal construction of the shielded grid valve which is now exciting so much interest.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280420.2.3.2
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Radio Record, Volume I, Issue 40, 20 April 1928, Page 2
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18This sketch shows the internal construction of the shielded grid valve which is now exciting so much interest. Radio Record, Volume I, Issue 40, 20 April 1928, Page 2
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