GPO 700 Series Terminal Strap - UK Vintage Radio Repair and Restoration Discussion Forum

Joey0027 · 22nd Aug 2014, 10:25 pm

Good evening

Does anybody know what the strap between T8 & T9 does? I was always under the impression that the strap should be present but I've seen images on the net of this strap removed on converted 746 telephones. I didn't really question it until I opened up my push button Trimphone & noticed that there was no strap between T8 & T9. I also have a dial Trimphone & the strap is present.

Many thanks.

Nickthedentist · 22nd Aug 2014, 10:54 pm

Hello,

It serves no purpose in phones converted for plug-in operation.

Nick.

ThePillenwerfer · 23rd Aug 2014, 12:45 am

It connects the line to one side of the bell capacitor. As the other side (T7) isn't connected to anything after conversion it doesn't matter if the T8-9 strap is there or not.

- Joe

Joey0027 · 23rd Aug 2014, 10:04 am

Many thanks for the replies Nick & Joe, much appreciated.

22nd Aug 2014, 10:25 pm	#1
Joey0027 Triode Join Date: Apr 2010 Location: Sleaford, Lincolnshire, UK. Posts: 48	GPO 700 Series Terminal Strap Good evening Does anybody know what the strap between T8 & T9 does? I was always under the impression that the strap should be present but I've seen images on the net of this strap removed on converted 746 telephones. I didn't really question it until I opened up my push button Trimphone & noticed that there was no strap between T8 & T9. I also have a dial Trimphone & the strap is present. Many thanks.

22nd Aug 2014, 10:54 pm	#2
Nickthedentist Dekatron Join Date: Jan 2005 Location: Oxford, UK. Posts: 17,846	Re: GPO 700 Series Terminal Strap Hello, It serves no purpose in phones converted for plug-in operation. Nick.

23rd Aug 2014, 12:45 am	#3
ThePillenwerfer Octode Join Date: Mar 2011 Location: Sheffield, South Yorkshire, UK. Posts: 1,453	Re: GPO 700 Series Terminal Strap It connects the line to one side of the bell capacitor. As the other side (T7) isn't connected to anything after conversion it doesn't matter if the T8-9 strap is there or not. - Joe __________________ "Experts are only good at one thing: explaining why something will not work!"

23rd Aug 2014, 10:04 am	#4
Joey0027 Triode Join Date: Apr 2010 Location: Sleaford, Lincolnshire, UK. Posts: 48	Re: GPO 700 Series Terminal Strap Many thanks for the replies Nick & Joe, much appreciated.