UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - British Telecom C2 klaxon and control box

TonyDuell · 31st Aug 2018, 5:05 am

Remember that when this device was in use, extension bells were connected in series, whereas now they are connected in parallel.

I'd try connecting the relay coil (orange and blue wires) with a 2k2 (or a 1k if the former doesn't work) in series between terminals 3 and 5 of the modern socket. If the telephones still ring and the relay operates then all you need to do is wire up the mains side.

31st Aug 2018, 5:05 am	#3
TonyDuell Dekatron Join Date: Jun 2015 Location: Biggin Hill, London, UK. Posts: 5,208	Re: British Telecom C2 klaxon and control box Remember that when this device was in use, extension bells were connected in series, whereas now they are connected in parallel. I'd try connecting the relay coil (orange and blue wires) with a 2k2 (or a 1k if the former doesn't work) in series between terminals 3 and 5 of the modern socket. If the telephones still ring and the relay operates then all you need to do is wire up the mains side.