Re: "Butt" 'phone
Here are some used in Norway:
The banana was used in the 70ies, later came the blue and orange ones. The las tone was made in Oslo-telefonanlegg (O.T.A.) by the workers there from the beginning, and until the banana was introduced.
dsk
Edit
Uploaded 2 more pictures, the diagram is from the Banana No induction coil, just resistors. It was working better with just transmitter and receiver in series!
Last edited by dagskarlsen; 26th May 2019 at 8:57 am.
Reason: adding info
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