CENTRALAB CONTROLS To control the volume of 8 speaker without affecting the volume of other speakers con- nected to the same amplifier is the use of the Constant Input Resistance THE PHONOGRAPH PICKUP FADER is 8 noiseless volume control for two pickups For every radio control there is 3 CENTRALAB: Write for Free Booklet, THOS: BALLINGER 8 COs; LTD: 58-62 VICTORIA STREET 8; WELLINGTON 66 Where the Quality Goods are Sold:"
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300221.2.86.3
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Radio Record, Volume III, Issue 32, 21 February 1930, Page 31
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71Page 31 Advertisement 3 Radio Record, Volume III, Issue 32, 21 February 1930, Page 31
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