22nd Apr 2019, 12:30 pm
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#2
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Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: M323 Mk1 with wind-up ringer???
Probably just two wires, they could be sound powered : https://en.wikipedia.org/wiki/Sound-powered_telephone.
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