A Potentiometer Warning
M NY present-day sets use potentiometers for controlling reaction, and for adjusting screen grid potential. It is not widely known, l.owever, that there is a right and wrong way of connecting one up. It should be connected in such a way that the battery switch throws it out of action when this is turned to the "off" position. Quite often it is so wired that it is not cut out of the circuit when the switch is so turned. A 800 ohms potentiometer across a six-volt battery passes 20 m. amps continuously. ‘The drain is small, but in time it will run the battery down. Matters are still worse where a potentiometer is connected wrongly across the "B" battery for adjusting screen grid potentials, for a few mills continuous drain will soon flatten the heaviest type "B" battery. * ,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320108.2.37
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Radio Record, Volume V, Issue 26, 8 January 1932, Page 13
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141A Potentiometer Warning Radio Record, Volume V, Issue 26, 8 January 1932, Page 13
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