BELLSET No. 31
used by the BPO on Direct Exchange Lines with Telephone No's 156LB,
196LB or 246 in L.B.
exchange areas. Also used on CBS
Exchanges No's 1, 2 &
Came complete with twin bell gongs, 1000 ohm ringer, Capacitor and a Coil, Induction No. 21.
The Bellset is usually wall mounted and the cover was produced in plastic in the colours black, red, green and ivory. The early covers were replaced circa 1975 with a thinner plastic cover coloured grey or ivory.
The early covers were Part No. 1/SCO/1 Colour, the black being produced in Phenolic Resin, Type GX (Specs BS771 & S116) and the three colours in Diakon, Grade L.A. (Spec S116).
The later cover was called the Cover No. 71A Colour and made of Toughened Polystyrene Type 1 (Specs BS3126 & S116).
The early cased bell sets could be fixed under a 100 or 200 type table telephone. Special fixing screws are required which supplied as standard on the earlier bell sets. A Cord, Instrument No. 4/51H, Brown, 9" or Cord., Instrument No 5/22H, Brown, 9" would also be required.
Bellset includes (1946):-
Bellset includes (1956):-
Internal view of the Bellset
Bellset No. 31 wiring diagram
Last revised: January 25, 2022