"THE fact that a valve filament is intact does not necessarily mean that it is in good order, for it may have lost its emission.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290322.2.42
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Radio Record, Volume II, Issue 36, 22 March 1929, Page 12
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25Untitled Radio Record, Volume II, Issue 36, 22 March 1929, Page 12
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