DC
bell with a 2.5 inch gong. DC
bell with a 2.5 inch gong.
Diagram N656
Operating voltages:-
Bell 56A - 2-5 or 5-10 volts dc (2 x 50 ohm coils)
Bell 56C - 10-25 or 25-60 volts dc (2 x 1000 ohm coils)
Internal use only.
Coloured black these bells were universally used throughout BT and many private companies.
Early versions may have a wooden base or metal cover. Most will be made out of plastic.
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