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Old 3rd Nov 2019, 3:51 pm   #47
ms660's Avatar
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 10,592
Default Re: Vintage Radio and Phonograph cutter schematic

No, don't bypass the field coil of the internal loudspeaker, that winding is essential for the proper operation of the unit.

An external loudspeaker can be used plugged into the jack socket provided.

That will disconnect the internal loudspeakers voice coil, the external loudspeaker can be either of the permanent magnet type or the electrodynamic type, if an electrodynamic type is used it will have to have its own field coil supply.

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