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-   -   GEC Loudspeaking telephone (https://www.vintage-radio.net/forum/showthread.php?t=177701)

JohnBHanson 12th Mar 2021 5:35 pm

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.

Pellseinydd 13th Mar 2021 11:23 am

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

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.

Thanks.


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