TELEPHONE No. 164
|Standard handset, made of Bakelite and used on most GPO 200
and 300 type telephones. The very early Handset No. 164's had
the mouthpiece retained by screws on the outer edge.
Circuit diagram N264.
Can be fitted with a Receiver No. 1L or 2P - see below for more
Receivers Inset 1L and 2P
Early handsets were fitted with a Receiver No. 1L but these were superseded by the Receiver inset 2P. The two are not interchangeable unless the correct diaphragm and earpiece are used.
Remove of the Receiver and Mouthpiece
Once removed - slide off the diaphragm - see the picture to the right. Then you will find two screws - remove these screws and the receiver will fall out.
To be honest they do not go wrong often. The normal problems with them are:-
To remove, use a drawing pin and push into the hole under pressure (choose a pin that does not have the centre pin showing on the back - there is a danger of this being pushed out due to pressure!). This pushes one of the metal lug inwards and allows the mouthpiece to be unscrewed anticlockwise.
The Microphone Inset will drop out exposing the screw terminals for the handset cord.
To assemble, insert the Transmitter and then locate the mouthpiece, ensuring that the hole is close to the handset handle, push down and then rotate clockwise until the spring locates. Once located try turning anticlockwise to make sure the spring clip prevents removal.
Last revised: October 16, 2012