THE DIFFERENTIAL FOUR That extra stage will make all the difference to your results. It will not be expensive to add either: Look at these prices Transformer 10/6 Ferranti ZAR. 4_ 0 0 .81/3/- Valve, we recommend B405 for greatest "lift and output 15/- Valve Socket .1/6 Anti-motor boating device, 600 ohm rebistance and 2 mfd; condenger 6/6 400 ohm Potentiometer 5/6 Send for our Price' List: AlI Postage Free. JHE C.A.s; (Country Accessories Supply) 29 VENTNOR STREET; SEATOUN, WELLINGTON:
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310403.2.54.1
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Radio Record, Volume IV, Issue 38, 3 April 1931, Page 17
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80Page 17 Advertisement 1 Radio Record, Volume IV, Issue 38, 3 April 1931, Page 17
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