O not use an ordinary small H.T. _ battery if your set has a power valve, as so much H.T. current is required by a valve of this type that it is essential to use a large-capacity H.T. battery or else a mains unit.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290412.2.20
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Radio Record, Volume II, Issue 39, 12 April 1929, Page 7
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43Untitled Radio Record, Volume II, Issue 39, 12 April 1929, Page 7
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