BELLSET No. 50

A wall mounted Bellset for internal use, generally found in customers premises. They were always hard wired into the telephone line. There is no Bellset No. 50E but many confuse this with the Bell No. 50E.

All these Bellsets are supplied with a capacitor, which is soldered onto the circuit board.

Bellsets No's 50A to 50D are fixed to the wall with a Bracket, Telephone No. 16. This is a 'T' shaped metal bracket, the same bracket used on 700 type wall phones.

Rear view showing T bracket in place

The cover is plastic and were available in grey and ivory. The cover is called a Part 1/DCO/763.

To remove the cover on Bellset No's 50A to 50D:-
Grasp the lower edge of the cover and pull toward yourself. The cover will easily unclip and once it is swung out about an inch then lift the cover upwards to dislocate the upper clip. Refitting is the same principle but in reverse.

To remove the bellset from the wall mounting on Bellset No's 50A to 50D:-
Remove cover as above and then locate the screw fitted centrally at the lowest part of the bellset. Once the screw is release, then grasp the bellset at the lower edge and pull towards you. Swing upwards about an inch and pull the top end away from the wall bracket clips. Refitting is the same principle but in reverse.

Circuit diagram - N550.

Bellset No. 50A
A standard Bellset (1000ohm bell ringer & capacitor). Supersedes Bell No. 59A and Bellset No. 26. Fitted with Bell No. 59C-1 and Telephone-Unit 1/D93315.

It was superseded by Bellset No. 50C.

Drawing - 93314.

Circuit Diagram - SA/SAW4287.

Bellset No. 50A
Using early style circuit board

Bellset No. 50B
A Bellset containing a Telephone No. 746 circuit for use with the Telephone No. 713. This Bellset Superseded the Bellset No. 48. It is fitted with Bell No. 59C-1 and Telephone-Unit 2/D93315.

It was superseded by the Bellset No. 50D.

A Buzzer No. 32C-3 can be fitted to the circuit board mounting brackets.

Drawing - 93314.

Circuit diagram - SA/SAW4288.

Bellset No. 50B (did not come originally with a cord)

Bellset No. 50C
Standard Bellset for new plan (PST - 4000 ohm ringer & capacitor).
Fitted with Bell No. 59D-1 and Telephone-Unit 1/D93315. This Telephone-unit was originally the same size as a telephone circuit board but later on was miniaturised. Both circuit boards are shown below.
Plastic cover in grey or ivory.

Circuit Diagram - SA/SAW4287.


Bellset No. 50C (cover on)	Bellset No. 50C (cover removed) This Bellset shows the small Telephone Unit

Bellset No. 50C using Telephone-unit 1/D93315

Bellset No. 50D
High impedance version of the Bellset No. 50B for use with Telephone No. 713.
Fitted with Bell No. 59D-1 and Telephone-Unit 2/D93315.

Circuit diagram - SA/SAW4288.

ADDITIONAL INFORMATION
Bellsets No. 50B (Low Impedance bell set for use with hard wired, series connected extension bell arrangements) are no longer available centrally on BT. Local stocks should only be used to maintain existing hard wired installations, when local stocks exhaust, faulty Bellsets No. 50B should be maintenance replaced by Bell No. 50E and system converted to PST. Existing serviceable Bellsets No. 50B and 50C may be used for internal shifts.

Click here for the difference between a Bell and a Bellset

Converting to work in the UK on PST

Connecting a PST line cord to a Bellset No. 50A or 50B (500 ohm bell coils)
Follow the following instructions:-