PMBEMBER that celluloid as used for coil formers, ete. is very inflammable, so that great care should be taken if any of this material is lying on a work-bench when soldering. A 25,000-ohm resistance instead of an R, F. choke will sometimes allow smoother reaction control to be obtained.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320205.2.38
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Radio Record, Volume V, Issue 30, 5 February 1932, Page 13
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49Untitled Radio Record, Volume V, Issue 30, 5 February 1932, Page 13
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