Roberts BR Valve Portable - UK Vintage Radio Repair and Restoration Discussion Forum

technotel · 3rd Feb 2020, 11:19 am

Late I know but belated Happy NY to you all.
I purchased a beautiful red Roberts BR from a restorer on eBay. I also purchased as recommended by him, a battery eliminator power supply. I am currently installing it and bearing in mind I want as little modification and cabinet damage as poss. Therefore drilled small hole in bottom of cabinet for the new mains cable where the hole could not be seen.
Whilst being pretty sure? Could someone confirm the yellow LT wire is minus and the Green LT wire is plus ?
I also think there is missing a screening can from a valve (top left) I watched a Youtube video of one of these sets and clearly saw a can on top left valve.
I would appreciate if you guys knows where I could source one? is it a standard size used by many valve port sets?
Thanks all

ms660 · 3rd Feb 2020, 1:03 pm

So far as I can make out from the Trader sheet LT-ve is connected to chassis.

In another model (R55) LT-ve is shown as green and LT+ve is shown as yellow in the Trader sheet.

Lawrence.

technotel · 4th Feb 2020, 3:56 pm

Hi Lawrence
Many thanks. I guess green being -ve makes sense. The old earth colour code on mains plugs used green for earth. I will meter it out.

3rd Feb 2020, 11:19 am	#1
technotel Pentode Join Date: May 2018 Location: High Wycombe, Buckinghamshire, UK. Posts: 135	Roberts BR Valve Portable Late I know but belated Happy NY to you all. I purchased a beautiful red Roberts BR from a restorer on eBay. I also purchased as recommended by him, a battery eliminator power supply. I am currently installing it and bearing in mind I want as little modification and cabinet damage as poss. Therefore drilled small hole in bottom of cabinet for the new mains cable where the hole could not be seen. Whilst being pretty sure? Could someone confirm the yellow LT wire is minus and the Green LT wire is plus ? I also think there is missing a screening can from a valve (top left) I watched a Youtube video of one of these sets and clearly saw a can on top left valve. I would appreciate if you guys knows where I could source one? is it a standard size used by many valve port sets? Thanks all

3rd Feb 2020, 1:03 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Roberts BR Valve Portable So far as I can make out from the Trader sheet LT-ve is connected to chassis. In another model (R55) LT-ve is shown as green and LT+ve is shown as yellow in the Trader sheet. Lawrence.

4th Feb 2020, 3:56 pm	#3
technotel Pentode Join Date: May 2018 Location: High Wycombe, Buckinghamshire, UK. Posts: 135	Re: Roberts BR Valve Portable Hi Lawrence Many thanks. I guess green being -ve makes sense. The old earth colour code on mains plugs used green for earth. I will meter it out.