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.

After introduction of the Telephone No. 164, refurbished Telephones No's 59 & 88 were converted to accept these handsets.

Circuit diagram N264.

Click here for the circuit diagram - N264.

Can be fitted with a Receiver No. 1L or  2P - see below for more information.
 

See also the Telephone Efficiency Committees Report on Local Battery Area telephones

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Early handsets were fitted with a Receiver No. 1L but these were superseded by the Receiver inset 2P.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.



Receiver No. 1L with Diaphragm No. 12 and Earpiece No 18

 



Receiver No. 2P with Diaphragm No. 25 and Earpiece No 23

Remove of the Receiver and Mouthpiece

Receiver
The Earpiece must be firstly removed by unscrewing anticlockwise.  This will either be very easy or very hard.  If the earpiece will not budge then try the following:-

  1. Ask a friend to have a go - my neighbour is great with these.

  2. Spray WD40 around the edge, hoping that it penetrate the thread.  Leave a couple of days.

  3. Use a vice and wrap the earcap in a rag or card board - be careful.

  4. Lower the earpiece into a cup of very hot water - hopefully it will expand.

  5. Cover with a rag and tap the earpiece on a hard surface - this may break the earcap!

  6. Smash it and replace!

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:-

  1. One of the screws is not tightened down.

  2. Diaphragm missing.

  3. Ingress of water rusting the internals.

  4. Rust on the pole faces.


Mouthpiece
The mouthpiece is located on three lugs, one of which is sprung loaded.  The mouthpiece has a hole which can be located on the handle side of the handset.

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.

 
 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: December 01, 2018

FM