A SEPARATE "B" + tapping ‘for each valve is one good method of reducing the effect of battery coupling
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https://paperspast.natlib.govt.nz/periodicals/RADREC19301024.2.30
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Radio Record, Volume IV, Issue 15, 24 October 1930, Page 7
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18Untitled Radio Record, Volume IV, Issue 15, 24 October 1930, Page 7
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