[fF you find that an abnornially heavy plate current is being taken by an R.C. coupled valve with normal grid bias, the insulation of the coupling condenser can be suspected, as it is possible that B battery leakage across this component will nullify the value of the grid bias to some extent.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311023.2.44
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Radio Record, Volume V, Issue 15, 23 October 1931, Page 17
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52Untitled Radio Record, Volume V, Issue 15, 23 October 1931, Page 17
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