Telephone No. 710. - UK Vintage Radio Repair and Restoration Discussion Forum

SeanStevens · 30th Sep 2009, 10:20 am

Anybody who has experience converting old phones to the new socket type? The task I have is to convert a 710.

SENA

Nickthedentist · 30th Sep 2009, 10:27 am

Hi Sean,

See here: http://www.britishtelephones.com/t710.htm

Should be quite easy

Nick.

russell_w_b · 30th Sep 2009, 10:31 am

Quote:

Originally Posted by SeanStevens

'The task I have is to convert a 710.'

Proceed as for a 706 as shown here.

I converted a 710 that has two buttons: latching and non-latching. I wired the latching button as a 'bell-off' switch, and the non-latching button as a mute (secret) button. Just because they were there!

Nice instrument, the 710. Try and get a type 21 mic insert for it if you can.

SeanStevens · 30th Sep 2009, 11:06 am

Thanks Gents - I had been to this site and it seems very comprehensive - except:

1. Mine has 5 wires (standard 4 plus and orange one)

2. I do not want to replace the wiring to the phone, I want to wire the modern socket back to the old BT oval junction box.

Phone has one 'blank' switch at the top. From the dial it is a 710 (plain dial, no printing at all) with outer ring bezel showing numbers and letters.

What I like about it most is that it came unconverted, with the old junction box connected!

SEAN

Nickthedentist · 30th Sep 2009, 11:20 am

Yes, it's nice to find old phones that haven't been messed with or been cobbled together from various different instruments.

I would just ignore any spare wires. There are usually several unused terminals on the bottom row which can be used to "park" them.

The obvious thing to do is to retain the original lead and junction box, and fit a short, modern wire complete with BT plug to the junction box.

Start by re-wiring it as Bob recommends for the basic dial phone, i.e. the 706, as Russell suggested above.

What does the white printing underneath say?

Nick.

SeanStevens · 30th Sep 2009, 11:33 am

I'm at work now but will take a gander tonight at the printing.

I was hoping to 'spur' off of the existing box - so a modern phone could be plugged in if required, but the old 710 would be hard wired to the old wall socket.

Both solutions would work I suppose.

[]................()....................710

Modern.........old..................phone
socket..........socket

SEAN

Station X · 30th Sep 2009, 11:42 am

I'm confused I think we need a rough sketch of what your existing installation looks like and what you want it to look like.

Modern phones and old phones are wired differently. You can't mix and match. The difference is that old phones had the ringing capacitor inside ONE PHONE ONLY with all the bells in all the phones in series with the capacitor. Modern phones have no internal ringing capacitor inside them, they use a capacitor in the master jack. All the bells are wired in parallel with each other and then in series with the capacitor in the master jack. Of course old phones can be converted to use modern ringing arrangements.

Also remember that you mustn't interfere with the wiring of the master jack. You can of course use whatever extension wiring arrangements you like, so long as they work correctly.

Nickthedentist · 30th Sep 2009, 11:50 am

Further to Graham's excellent advice, you could hard wire this to one of your existing extension sockets, but not the master socket, and not unless you "convert" it first (as instructed in the links above, but not bothering with a modern plug).

Should be good.

Nick.

AndiiT · 30th Sep 2009, 7:08 pm

Hi,
To use your 710 as a "Hard wired" phone as an extension from the master line jack proceed as follows -

Firstly extend some two or three pair telecoms cabling from the faceplate of your telephone service providers NTP (network termination point, i.e. the telephone line jack) wired Blue/White to Pin 2 Orange/White to Pin 3 and White/Blue to Pin 5 - terminate the other end of these wires on the BT52A (it may be a 35A which has six terminals) junction box that came with your telephone, each wire to a separate terminal.

Disconnect the line cord of your 710 from the telephone end and connect the wires at the junction box end as follows -

White of line cord to White/Blue
Red of Line cord to Blue/White
Blue of line cord to Orange/White
Terminate any spare wires in the cord on any spare terminals in junction box, insulate these if you do not have enough spare terminals.

At the telephone end strap and wire thus -

Strap T16 - T17 - T18 - T19

Strap T4 - T5 - T6

Red of line cord to T8, ensuring that orange lead of dial also terminates at this point
Blue of line cord to T5
White of line cord to T18
Orange and Green of line cord to any spare terminals in telephone (usually T11 to T15

If ringing problems are experienced substitute strap T4 - T5 with a 3k3 Ohm 0.5W resistor

As long as you wire via the faceplate of your NTP, or from any extension socket this should be OK. DO NOT wire direct to your incoming line terminations as this is classed as tampering with your service providers part of the network.

More information about NTP's can be found here

Regards
Andrew

30th Sep 2009, 10:20 am	#1
SeanStevens Octode Join Date: Sep 2009 Location: Bath, Somerset, UK. Posts: 1,033	Telephone No. 710. Anybody who has experience converting old phones to the new socket type? The task I have is to convert a 710. SENA __________________ There are only 10 types of people, those who understand the binary system, and those who don't.

30th Sep 2009, 10:27 am	#2
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,846	Re: Telephone No. 710. Hi Sean, See here: http://www.britishtelephones.com/t710.htm Should be quite easy Nick.

30th Sep 2009, 11:06 am	#4
SeanStevens Octode Join Date: Sep 2009 Location: Bath, Somerset, UK. Posts: 1,033	Re: Telephone No. 710. Thanks Gents - I had been to this site and it seems very comprehensive - except: 1. Mine has 5 wires (standard 4 plus and orange one) 2. I do not want to replace the wiring to the phone, I want to wire the modern socket back to the old BT oval junction box. Phone has one 'blank' switch at the top. From the dial it is a 710 (plain dial, no printing at all) with outer ring bezel showing numbers and letters. What I like about it most is that it came unconverted, with the old junction box connected! SEAN __________________ There are only 10 types of people, those who understand the binary system, and those who don't.

30th Sep 2009, 11:20 am	#5
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,846	Re: Telephone No. 710. Yes, it's nice to find old phones that haven't been messed with or been cobbled together from various different instruments. I would just ignore any spare wires. There are usually several unused terminals on the bottom row which can be used to "park" them. The obvious thing to do is to retain the original lead and junction box, and fit a short, modern wire complete with BT plug to the junction box. Start by re-wiring it as Bob recommends for the basic dial phone, i.e. the 706, as Russell suggested above. What does the white printing underneath say? Nick.

30th Sep 2009, 11:33 am	#6
SeanStevens Octode Join Date: Sep 2009 Location: Bath, Somerset, UK. Posts: 1,033	Re: Telephone No. 710. I'm at work now but will take a gander tonight at the printing. I was hoping to 'spur' off of the existing box - so a modern phone could be plugged in if required, but the old 710 would be hard wired to the old wall socket. Both solutions would work I suppose. []................()....................710 Modern.........old..................phone socket..........socket SEAN __________________ There are only 10 types of people, those who understand the binary system, and those who don't. Last edited by SeanStevens; 30th Sep 2009 at 11:39 am. Reason: diagram format errors

30th Sep 2009, 11:42 am	#7
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,288	Re: Telephone No. 710. I'm confused I think we need a rough sketch of what your existing installation looks like and what you want it to look like. Modern phones and old phones are wired differently. You can't mix and match. The difference is that old phones had the ringing capacitor inside ONE PHONE ONLY with all the bells in all the phones in series with the capacitor. Modern phones have no internal ringing capacitor inside them, they use a capacitor in the master jack. All the bells are wired in parallel with each other and then in series with the capacitor in the master jack. Of course old phones can be converted to use modern ringing arrangements. Also remember that you mustn't interfere with the wiring of the master jack. You can of course use whatever extension wiring arrangements you like, so long as they work correctly. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

30th Sep 2009, 11:50 am	#8
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,846	Re: Telephone No. 710. Further to Graham's excellent advice, you could hard wire this to one of your existing extension sockets, but not the master socket, and not unless you "convert" it first (as instructed in the links above, but not bothering with a modern plug). Should be good. Nick. Last edited by Nickthedentist; 30th Sep 2009 at 12:06 pm.

30th Sep 2009, 7:08 pm	#9
AndiiT Octode Join Date: Aug 2005 Location: Saltburn-East, Cleveland, UK. Posts: 1,786	Re: Telephone No. 710. Hi, To use your 710 as a "Hard wired" phone as an extension from the master line jack proceed as follows - Firstly extend some two or three pair telecoms cabling from the faceplate of your telephone service providers NTP (network termination point, i.e. the telephone line jack) wired Blue/White to Pin 2 Orange/White to Pin 3 and White/Blue to Pin 5 - terminate the other end of these wires on the BT52A (it may be a 35A which has six terminals) junction box that came with your telephone, each wire to a separate terminal. Disconnect the line cord of your 710 from the telephone end and connect the wires at the junction box end as follows - White of line cord to White/Blue Red of Line cord to Blue/White Blue of line cord to Orange/White Terminate any spare wires in the cord on any spare terminals in junction box, insulate these if you do not have enough spare terminals. At the telephone end strap and wire thus - Strap T16 - T17 - T18 - T19 Strap T4 - T5 - T6 Red of line cord to T8, ensuring that orange lead of dial also terminates at this point Blue of line cord to T5 White of line cord to T18 Orange and Green of line cord to any spare terminals in telephone (usually T11 to T15 If ringing problems are experienced substitute strap T4 - T5 with a 3k3 Ohm 0.5W resistor As long as you wire via the faceplate of your NTP, or from any extension socket this should be OK. DO NOT wire direct to your incoming line terminations as this is classed as tampering with your service providers part of the network. More information about NTP's can be found here Regards Andrew