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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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12th Mar 2021, 6:35 pm | #1 |
Heptode
Join Date: Aug 2009
Location: Worthing, Sussex, UK.
Posts: 662
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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. |
13th Mar 2021, 12:23 pm | #2 |
Heptode
Join Date: Jul 2007
Location: Flintshire, UK.
Posts: 707
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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 |
23rd Mar 2021, 10:50 pm | #3 |
Heptode
Join Date: Aug 2009
Location: Worthing, Sussex, UK.
Posts: 662
|
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. |
7th Apr 2021, 9:38 pm | #4 |
Heptode
Join Date: Aug 2009
Location: Worthing, Sussex, UK.
Posts: 662
|
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. |