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Radio Record, Volume III, Issue 13, 11 October 1929, Page 2

. WELL-ARRANGED choke output not only insulates the loudspeaker " from the high-tension supply, but it reduces the possibility of losing hightension’ voltage by leakage between WA output leads. F you are using choke output for a short-wave set to obviate thresh ald." howl troubles, remember that a large L.F. choke’ is. quite unnecessary. and that an old L.¥. transformer secondary will generally be found pérfectly O.K. for the purpose.