Browning-Drake Results.
UMEROUS constructors are reporting success with the Brown-ing-Drake four-valver constructed according to the recently-published specifications. Several who have built it FE replace three-coil circuits are pleaswith the great improvement in volume, selectivity, and tone.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280330.2.31.6
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Radio Record, Volume I, Issue 37, 30 March 1928, Page 13
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36Browning-Drake Results. Radio Record, Volume I, Issue 37, 30 March 1928, Page 13
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