SIEMENS BROTHERS No. 312
Siemens Brothers Neophone 312
Novice collectors are often baffled by these 200-type telephones with 300-series numbers on the paster diagrams but thats because Siemens Brothers (SB) had their own numbering system. The company named all of their 200 style telephones: Neophones.
The Type 312 is a one-piece instrument with a larger case than the Siemens 300 style telephone and built-in ringer. The case mouldings are also much sharper than the rounded edges of the 310.
The Type 312 is also known as the Universal Neophone.
The handset was identical to the BPO No. 164 design with the normal ‘spit cup’ over the microphone.
Conversion to UK Plug and Socket
To wire a Type 312 to the UK telephone socket system follow these instructions. It is illegal to connect unapproved apparatus to any public network.
If you wish to use the telephone without the bell - because old mechanical ringers can sometimes cause problems - then leave out the resistor and wire strap.
It may also be desirable to also modify the telephone as recommended in the section on how the convert to PST.
Last revised: February 22, 2023