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Old 12th Mar 2021, 5:35 pm   #1
JohnBHanson
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Location: Worthing, Sussex, UK.
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Default 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.
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Old 13th Mar 2021, 11:23 am   #2
Pellseinydd
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Default 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
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Old 23rd Mar 2021, 9:50 pm   #3
JohnBHanson
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Default 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.
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Old 7th Apr 2021, 8:38 pm   #4
JohnBHanson
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Default 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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