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Blivit42 21st Jul 2020 9:47 am

Odd 706
Hi, I have a 706 telephone that seems to be non-standard.
I had two of these phones that I got from the same person. I tried converting them, one worked, the other didn't. The incoming line went off for a short time, so I assumed there was a short and I started to look for faults and tracing the internal wiring.

It seems to be an early version of the 706 without a PCB. I noticed two odd things.

1) The Automatic Sensitivity Regulator is missing and only the terminals A, C & E are fitted. The 706 phone should work with the regulators reversed, which would connect terminals B, C and D, but since B and D are missing, this won’t do anything.

2) The Induction coil No. 31 is missing and doesn't seem to have ever been installed. Maybe someone has removed it.

There is a wiring schematic N112419/4 pasted inside the cover of the phone which doesn't show the induction coil or the regulator, so I don't think it has been altered. It differs from the wiring shown on standard N806 diagram.

Can anyone tell me what this phone might be and if could be converted? I suspect it may have been a special for an extension, which won't work on its own.

Thanks for any help.

Dave Moll 21st Jul 2020 10:03 am

Re: Odd 706
See for more information about this model of telephone.

Nickthedentist 21st Jul 2020 10:05 am

Re: Odd 706
Yes, it's basically a cost-reduced Ericsson phone designed for use as an extension on a private exchange like you might find in a big office or factory etc.

It will work on a normal BT line.


Blivit42 21st Jul 2020 10:12 am

Re: Odd 706

Originally Posted by Dave Moll (Post 1271607)
See for more information about this model of telephone.

That's it, thank you very much. Several hours of Googling had failed to turn up that connection. I will read that and come back if I'm still baffled.

Dave Moll 21st Jul 2020 10:13 am

Re: Odd 706
Perhaps an image of how yours is wired might give a clue regarding why it isn't working.

Blivit42 21st Jul 2020 12:18 pm

Re: Odd 706
Thanks, I'll have another look at it this evening and will take some pictures tomorrow.

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