SCHEMATIC DIAGRAM. Note that the filaments are in series to reduce the total consumption, and that the jack is not shown.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291129.2.67.2
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Radio Record, Volume III, Issue 20, 29 November 1929, Page 29
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21SCHEMATIC DIAGRAM. Note that the filaments are in series to reduce the total consumption, and that the jack is not shown. Radio Record, Volume III, Issue 20, 29 November 1929, Page 29
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