CENTRALAB CONTROLS To control the volume of 2 speaker without affecting the volume of other speakers con- nected to the same amplifier is _ the use 0f the Constant Input Resistance THE PHONOGRAPH PICKUP FADER is noiseless volume control for two pickups. For every radio control there is a CENTRALAB: Write for Free Booklet, THOS: BALLINGER 8 Co.; LTD. 58-62 VICTORIA STREET 88 WELLINGTON Where the Quality Goods are Sold:"
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300307.2.11.1
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Radio Record, Volume III, Issue 34, 7 March 1930, Page 3
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69Page 3 Advertisement 1 Radio Record, Volume III, Issue 34, 7 March 1930, Page 3
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