GEC Loudspeaking telephone
 

I have one of these, but little infomation on it:-

https://www.britishtelephones.com/gec/tel1l.htm

Ideally I would like a circuit
diagram or a connection diagram - but any infomation would be useful -
especially about the jumpers inside. Thank you.

I am sure someone somewhere has diagrams for this.

Thanks.

Re: GEC Loudspeaking telephone
 

More info about the GPO version (produced by GEC) at https://britishtelephones.com/lst2.htm

Circuit diagrams of GPO version available to Telecoms Heritage Group members via BT Archives

Re: GEC Loudspeaking telephone
 

Looking at the circuit diagrams of the LST2a and LST2b tells an interesting
story - the optimisation of the line circuit for single line working including
the change from using relays to using contacts on the ans switch.

Very interesting.

Re: GEC Loudspeaking telephone
 

Still not found the required circuit diagram, but LST2 is helpful as I think the amplifier section is similar or maybe even the same.

Anyone out there that can post the correct diagram would be nice.

Thanks.