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Old 11th Jun 2018, 10:17 pm   #15
OscarFoxtrot
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Join Date: Apr 2011
Location: Edinburgh, UK.
Posts: 805
Default Re: So I've bought a pair of red BT intercom phones...

These days, the VoIP adaptor configured as a ringdown circuit is probably the cheapest and easiest way of doing it. If you want to build your own

https://www.vintage-radio.net/forum/...9&d=1485945957

Not completely sure, but I think you have a missing regulator board in your 706. It plugged into the ABCDE contacts.

Refer
http://www.samhallas.co.uk/repositor.../0000/N806.pdf

which suggests that the phone should work de-regulated if BCD are connected together.

You also appear to be missing your bellmotors. Bell unmounted 59B ?
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