RECEIVERS BELL

For general use.  The coil is of 60ohms resistance.

Mark B includes:-
1 x Earpiece No. 1.
1 x Diaphragm No. 9.

Marks C, D and 4001 includes:-
1 x Earpiece No. 2.
1 x Diaphragm No. 12.

Mark NT10 includes:-
1 x earpiece No. 1.
1 x Diaphragm No. 19.

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Used on primary battery telephones.  The coil is of 120ohms resistance.

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This receiver has no permanent magnet and the coil is of 25ohm resistance.

Used mainly on fire alarm circuits with Telephone No's 53 and 67.

Normally fitted with a Cord,  Instrument No. 222.

Includes:-
1 x Diaphragm No. 12.
1 x Earpiece No. 2.
 

This Receiver has no permanent magnet and the coil is of 60ohms resistance.  It is also called an Electro-magnetic receiver.

Used on Telephones No's 55, 55B, 72, 72A and 98.

American make includes:-
1 x Diaphragm No. 9.
1 x Earpiece No. 4.

Mark 234 includes:-
1 x Diaphragm No. 12.
1 x Earpiece No. 2.

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