SIEMENS BROTHERS No. 354


No. 354
Wall telephone, in black moulded Bakelite case, comprising anti-sidetone induction coil (ASTIC), high efficiency 'Neophone' hand microtelephone with patented immersed electrode inset transmitter on automatic switch cradle; 1000 ohms ringer with 2.25in (57mm) diameter gongs.


 

Height Width Depth Weight (367A/A)
7.75in (197mm) 9in (229mm) 5in (127mm) 6lbs (2.7 kgs)

Note: The Siemens Brothers part numbers are not the same as the GPO equivalent part numbers.


Converting a Siemens Brothers No. 354 to work on the UK Plug and Socket system

  1. Discard any old cordage or wires that are connected to terminals L1, L2, C and E.

  2. Remove link between terminals L1 and E.

  3. Connect a 3.3k resistor to terminals L1 and E.

  4. Locate the capacitor (to the right of the bell ringer) and remove the white wire and insulate.

  5. The other tags on the capacitor (with wires coloured blue/white and green) should be linked together by either wrapping a wire around the connections or removing the two wires and joining them together.

  6. The white wire of the new line cord to terminal L1.

  7. The red wire of the new line cord to terminal L2.

  8. The blue wire of the new line cord to terminal C.

  9. The green wire of the line cord is not used and should be insulated.

  10. Connect a Rectifier Element No. 205 or similar to terminals 1 and 2.

 


Pictures

 

 

Base plate

 

 

 

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Last revised: November 21, 2023

FM2