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 and this was method was
probably only found on prototypes.
Introduced circa 1930.
There were two variants of Telephone No. 164, the Mark 1 and the Mark 2. The difference was that the Mark 1 had a Receiver, Inset, No. 1L whilst the Mark 2 had a Receiver, Inset, No. 2P. The Mark 1 is pictured above.
The Mark 2 was introduced circa 1946.
Drawing for Mark 1 - 9509/0
Circuit Diagram - N264.
Available in the colours - Black, Chinese Red, Ivory and Jade Green.
Telephone includes (1946 and 1956):-
This handset can be fitted with a Receiver No. 1L or 2P - see below for more information. The Receiver No. 2P was introduced in 1946.
Removal of Mouthpiece
How to wire a cord to the handset
All the above are Mark 2
Receivers Inset 1L and 2P
Early handsets were fitted with a Receiver, Inset No. 1L but these were superseded by the Receiver, Inset No. 2P in 1946. The two are interchangeable but only if the correct diaphragm and earpiece are used. This is because the receiver, the diaphragm and the earpiece are a matched set. If they are not matched then the speech reception will be faint.
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 often go wrong. The normal problems found 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: August 08, 2021