UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

AndiiT · 15th Jun 2019, 9:50 pm

Hi, whilst looking very much like a 746 this phone is most likely one end of a Plessey/Ericsson Plan system which were supplied on private rental to companies and were often used on PAX systems which didn't touch the public telephone network.

SEC'Y is indeed short for Secretary so this would have been the Manager end of the installation (often referred to as CHIEF by the phone supplier).
The additional contacts on the switches are for line/extension switching and this model looks like it may even contain a ringing generator.

I have a copy of a catalogue somewhere which may include your phone, feel free to PM me if you would like a copy to look at

Edit - I have just re read some of the comments and suspect that it may well be the equivalent of Plan 12A that Ian has posted a link to, the additional bell being contained in the phone rather than externally as shown on the N diagram.

Regards

Andrew

15th Jun 2019, 9:50 pm	#12
AndiiT Octode Join Date: Aug 2005 Location: Saltburn-East, Cleveland, UK. Posts: 1,786	Re: 746 phone with extra buttons Hi, whilst looking very much like a 746 this phone is most likely one end of a Plessey/Ericsson Plan system which were supplied on private rental to companies and were often used on PAX systems which didn't touch the public telephone network. SEC'Y is indeed short for Secretary so this would have been the Manager end of the installation (often referred to as CHIEF by the phone supplier). The additional contacts on the switches are for line/extension switching and this model looks like it may even contain a ringing generator. I have a copy of a catalogue somewhere which may include your phone, feel free to PM me if you would like a copy to look at Edit - I have just re read some of the comments and suspect that it may well be the equivalent of Plan 12A that Ian has posted a link to, the additional bell being contained in the phone rather than externally as shown on the N diagram. Regards Andrew Last edited by AndiiT; 15th Jun 2019 at 9:56 pm.