A MILLIAMMETER in the plate circuit of your last valve i )invaluable aid to quality J BP your batteries out of the way of window, or. covered well, as s1nlight directly on them is harmful.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311211.2.40
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Radio Record, Volume V, Issue 22, 11 December 1931, Page 30
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35Untitled Radio Record, Volume V, Issue 22, 11 December 1931, Page 30
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