N order to control volume by means of a potentiometer it is essential to use a high-resistance potentiometer of approximately the same ohmage as a grid leak. (The old-fashioned potentiometer as used for H.F. damping has a resistance of about 400 ohms, and is quite useless for volume control.)
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290125.2.70
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Radio Record, Volume II, Issue 28, 25 January 1929, Page 29
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49Untitled Radio Record, Volume II, Issue 28, 25 January 1929, Page 29
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