SIEMENS BROTHERS No. 307

A Bakelite cased table telephone supplied with a Bellset.

The information below is based on the South American model.

Conversion to the the UK plug and socket system

1. White of new line cord to L.
2. Red of new line cord to L2.
3. Blue of new line cord to C.
4. Green of new line cord is not used and should be insulated.
5. Fit a 3.3k resistor between L and E.
6. Fit a rectifier element 205 across telephone terminals 5 and 6.

7. Disconnect one wire from one of the terminals on the square capacitor fitted on the base plate and insulate.

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Diagram

Last revised: October 09, 2025

FM2