Reviving "B" Batteries
MANY "B" batteries produce grating and scratching noises some time before they are actually exhausted. Such noisés cin be eliminated and the useful life of the battery extended
by connecting across the block u twomicrofarad filter condenser of the type ordinarily sold for use in building a "B" eliminator and power amplified circuit. If two condensers are available connect one across the entire "B" voltage and the other across the detector "B" voltage. —
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300221.2.80
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Radio Record, Volume III, Issue 32, 21 February 1930, Page 29
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76Reviving "B" Batteries Radio Record, Volume III, Issue 32, 21 February 1930, Page 29
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