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JohnBHanson · 23rd Mar 2021, 10:50 pm

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.

23rd Mar 2021, 10:50 pm	#3
JohnBHanson Heptode Join Date: Aug 2009 Location: Worthing, Sussex, UK. Posts: 661	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.