Protecting Valves in Short--Wave Sets
HH new type 30 valves, used in short-wave sets, require a filament battery voltage of 2:2, and this should not be exceeded, or the life of the valve will be greatly shortened. A d.ec, voltmeter should be connected permanently across the filament of the valves, One meter. may be used for all valves, as they can be connected in parallel and served with a single rheosiat,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320701.2.63
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Radio Record, Volume V, Issue 51, 1 July 1932, Page 30
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71Protecting Valves in Short-Wave Sets Radio Record, Volume V, Issue 51, 1 July 1932, Page 30
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