Label Your Values
A PIECE of plain paper stuck ou the > pulb of the valve and marked with the date of purchase and the general characteristics will often save @ lot of hunting through data sheets, and also show whether the valve has given reasonable life. Do. not. use ordinary stamp paper, or even ordinary pastes or gums, but one of the stronger adhesives, such as seccotine, Otherwise the paper may scale off when dried by the slight heat of the valve. -The most generally useful facts to put on this label are date of purchase,'maximum plate voltage. filament voltage, impedance. amplification factor, and, in the case of super power valves, anode current and grid bias. --
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291115.2.64
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Radio Record, Volume III, Issue 18, 15 November 1929, Page 29
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115Label Your Values Radio Record, Volume III, Issue 18, 15 November 1929, Page 29
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