A HIGH magnification factor for & valve is nearly always associated with high impedance, and a low mage nification factor with low impedance. HERD is no need to build a special set for shortwave reception as most sets can easily be adapted for this, either by special coils or by a shorte wave adapter.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310807.2.59
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Radio Record, Volume V, Issue 4, 7 August 1931, Page 33
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53Untitled Radio Record, Volume V, Issue 4, 7 August 1931, Page 33
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