Tips and Jottings
S=NSITIVE measuring instruments " . Should not be placed close to powerful motors, dynamos, loudspeakers, or eliminators, as they may easily be seriously impaired in this manner. POWERFUL permanent magnets, as ‘x. used for moving-coil loudspeakers. or electro magnets, such as M.C, pot windings, create strong magnetic fields in the space around them, and therefore are to be shunned while wearing a delicate watch, which may easily become magnetised. [fF you are employing a neutralised oR.I. stage, do not forget that this will need re-neutralising if a different valve is employed for it. jy mearly all circuits it is the moving vanes of the variable condensers which are connected toward earth to avoid hand-capacity effects. ITH indirectly-heated A.C. valves the undésirable A.C. hum is eliminated by using a separate electronemitting ‘cathode heated. by radiation from a hot "filament" placed very close
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320108.2.28
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Radio Record, Volume V, Issue 26, 8 January 1932, Page 10
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142Tips and Jottings Radio Record, Volume V, Issue 26, 8 January 1932, Page 10
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