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Radio Record, Volume I, Issue 5, 19 August 1927, Page 12

Getting more stations with increased volume is not a matter of additg power valyes. ‘the latter are a de. velopment chiefly concerned with increasing tonal qualities, It is better to use aerial tuning if greater volume is expected on, more distant stations. Vurther improvement is | obtained by, using new valves. in the . radio-fre-quency stages, and a still further help is gained by using @ more sensitive -yalye iu the detector socket, ot ,