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General Vintage Technology Discussions For general discussions about vintage radio and other vintage electronics etc.

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Old 14th May 2022, 3:47 pm   #21
Ed_Dinning
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Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 7,348
Default Re: Transformer or choke and RC unit

Hi Adrian, plenty of IV transformers about, commonest ratio was 3:1, but many of them will need rewinding as one of the windings will be O/C.
Not difficult to do, but tedious due to the 1000's of turns needed.

Typically the speakers were a few thousand ohm impedance; not that the DC resistance would only be a few 100 ohms.
A modern speaker with a suitable output transformer works well

Ed
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