The filament of the 201A type valve inust not be heated with less than & volts, as thisi causes it to become brittle, In other words, to get absolute satisfaction from a valve, with correct plate and grid voltages, the filament must be. heated. with the voltage stated by the manufacturer, no higher or lower,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19270812.2.44
Bibliographic details
Radio Record, Volume I, Issue 4, 12 August 1927, Page 11
Word Count
54Untitled Radio Record, Volume I, Issue 4, 12 August 1927, Page 11
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