Six months is a good time to allow for the normal life of a grid-bias battery.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290201.2.49
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Radio Record, Volume II, Issue 29, 1 February 1929, Page 24
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16Untitled Radio Record, Volume II, Issue 29, 1 February 1929, Page 24
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