a eer) . T is most that the filament voltage should not be greater than that stated on the valve. Tf carefully treated valves may last for years. They should not be removed from their holders ‘unnecessarily.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280831.2.84
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Radio Record, Volume II, Issue 7, 31 August 1928, Page 31
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36Untitled Radio Record, Volume II, Issue 7, 31 August 1928, Page 31
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