CENTRALAB CONTROLS To control the volume of 3 speaker without affecting the volume of other speakers con- 'nected to the same amplifier is the use of the Constant Input Resistance TKE PHONOGRAPH PICKUP FADER is 3 noiseless volume control for two pickups. For every radio control there is a CENTRALAB: Write for Free Booklet; THOS: BALLINGER 8 COs, LTD: 58-62 VICTORIA STREET WELLINGTON Where the Quality Goods are Sold:
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300214.2.44.1
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Radio Record, Volume III, Issue 31, 14 February 1930, Page 21
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69Page 21 Advertisement 1 Radio Record, Volume III, Issue 31, 14 February 1930, Page 21
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