A single stage detecting valve to which an audio stage may be added.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290913.2.68.1
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Radio Record, Volume III, Issue 9, 13 September 1929, Page 26
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13A single stage detecting valve to which an audio stage may be added. Radio Record, Volume III, Issue 9, 13 September 1929, Page 26
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