ALTHOUGH with modern valves rheostats are not generally necessary, it is as well to remember that a filament adjustment of the detector valve on a short-wave set is often an i valuable aid to smooth reaction.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290405.2.10
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Radio Record, Volume II, Issue 38, 5 April 1929, Page 5
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36Untitled Radio Record, Volume II, Issue 38, 5 April 1929, Page 5
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