BELL No. 79A

Unicoil bell in general use from early seventies onwards.

This bell was first seen in GPO phones in the bell unit associated with all the Compact telephone variants.  See Telephone No. 776 for more details.

Bell No. 79A-2 - 1000 ohm version
Bell No. 79D - 4000 ohm version 

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Last revised: January 28, 2020