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Radio Record, Volume I, Issue 47, 8 June 1928, Page 16

BE. proper control of "A" battery current plays 2 big part in the quility o£ tone. If for instance, the "A" battery current is allowed to fall below the required strength for heating the filament of the valves, shrill music or speech is sure to be the result, It will be often found that the employment of the "C" battery in the grid circuit of the valve provides a means of improving. the tonai quality of some types of receivers, but this largely depends upon the nature of the circuit jin use, ,