F the wrong voltage is applied to its screening grid the average S&.G, valve misbehaves in a way that ordinary valves cannot do. Such a wrong voltage may send the valve into oscillation, causing unsteady and erratic reception.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311231.2.23
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Radio Record, Volume V, Issue 25, 31 December 1931, Page 5
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38Untitled Radio Record, Volume V, Issue 25, 31 December 1931, Page 5
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