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JohnBHanson 12th Mar 2021 5:35 pm

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

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.


Pellseinydd 13th Mar 2021 11:23 am

Re: GEC Loudspeaking telephone
More info about the GPO version (produced by GEC) at

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

JohnBHanson 23rd Mar 2021 9:50 pm

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.

JohnBHanson 7th Apr 2021 8:38 pm

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.


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