JF you have several loudspeakers in series working together, remember that any one can be switched out at will by connecting an ordinary onoff filament switch across its terminals.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19301024.2.53
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Radio Record, Volume IV, Issue 15, 24 October 1930, Page 15
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29Untitled Radio Record, Volume IV, Issue 15, 24 October 1930, Page 15
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