Audio Transformer Markings.
' When a transformer is marked with the "in and ont" of the windings, 1P conneets to positive B, OP to plate of ‘preceding valve, 1S to negative C, and & to arid of next valve,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280316.2.26.4
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Radio Record, Volume I, Issue 35, 16 March 1928, Page 10
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37Audio Transformer Markings. Radio Record, Volume I, Issue 35, 16 March 1928, Page 10
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