Murphy A852G RP - service data (actually an A862G RP). - UK Vintage Radio Repair and Restoration Discussion Forum

RojDW48 · 12th Feb 2018, 8:14 pm

I can't find the data for this RP on the site - any pointers gratefully received. It goes but rather poorly and the tone controls do nothing at all.

Nuvistor · 12th Feb 2018, 8:30 pm

I cannot find any info but from photos of the chassis on eBay it appears to be a simple two stage audio amp with a valve rectifier.
Shouldn’t be too difficult to sort out.

ukcol · 12th Feb 2018, 9:00 pm

What valves does your A852G use? The Murphy A851G (for which there is data available here) uses two ECL86s in push-pull and a metal rectifier.

RojDW48 · 13th Feb 2018, 8:37 pm

Thanks - it's a bit humbler than the A851G with A UY85 rectifier and a UCL82 output (2 stages in one valve?). Strange - with such similar model numbers. I revived an A851G some time ago and it was rather nice. I expect I can track down the usual suspect components from the pinouts but it would be reassuring to have a schematic. Pics attached - the fawn coloured, squareish components on the control panel are something I haven't seen before - capacitors? But no values visible.

Edward Huggins · 13th Feb 2018, 9:31 pm

I suspect that this may be the Murphy "Majorette" from 1968. Rank-Bush-Murphy also made Bush and Dansette versions, just with different badges. But to confirm we need pics.

ukcol · 13th Feb 2018, 11:44 pm

The Murphy A862G uses a UCL82 and a UY85 like your A852G. The picture of the chassis in the Trader sheet for the A862G looks very much like your picture. The Trader sheet for the A862G is available here

http://www.service-data.com/section.php/5166/1/a862g

and in my opinion is certainly worth a punt.

EDIT: I have just noticed that the Trader sheet calls the A862G the "Majorette" which fits in with Edward's suggestion above.

RojDW48 · 14th Feb 2018, 12:51 am

Thank you very much Colin - that's the one - I probably mis-read the '6' as a 5 - my eyesight is not what it was

. Interesting to know it was also marketed as a Bush - thanks, Edward.

12th Feb 2018, 8:14 pm	#1
RojDW48 Nonode Join Date: Jun 2014 Location: Bristol, UK. Posts: 2,074	Murphy A852G RP - service data (actually an A862G RP). I can't find the data for this RP on the site - any pointers gratefully received. It goes but rather poorly and the tone controls do nothing at all. __________________ '....don't go mistaking Paradise for that home across the road!' (Bob Dylan)

12th Feb 2018, 8:30 pm	#2
Nuvistor Dekatron Join Date: Aug 2013 Location: Wigan, Greater Manchester, UK. Posts: 9,433	Re: Murphy A852G RP - service data I cannot find any info but from photos of the chassis on eBay it appears to be a simple two stage audio amp with a valve rectifier. Shouldn’t be too difficult to sort out. __________________ Frank

12th Feb 2018, 9:00 pm	#3
ukcol Rest in Peace Join Date: May 2003 Location: Harlaxton, Lincolnshire, UK. Posts: 3,944	Re: Murphy A852G RP - service data What valves does your A852G use? The Murphy A851G (for which there is data available here) uses two ECL86s in push-pull and a metal rectifier.

13th Feb 2018, 8:37 pm	#4
RojDW48 Nonode Join Date: Jun 2014 Location: Bristol, UK. Posts: 2,074	Re: Murphy A852G RP - service data Thanks - it's a bit humbler than the A851G with A UY85 rectifier and a UCL82 output (2 stages in one valve?). Strange - with such similar model numbers. I revived an A851G some time ago and it was rather nice. I expect I can track down the usual suspect components from the pinouts but it would be reassuring to have a schematic. Pics attached - the fawn coloured, squareish components on the control panel are something I haven't seen before - capacitors? But no values visible. Attached Thumbnails __________________ '....don't go mistaking Paradise for that home across the road!' (Bob Dylan)

13th Feb 2018, 9:31 pm	#5
Edward Huggins Dekatron Join Date: Sep 2015 Location: Southwold, Suffolk, UK. Posts: 8,328	Re: Murphy A852G RP - service data I suspect that this may be the Murphy "Majorette" from 1968. Rank-Bush-Murphy also made Bush and Dansette versions, just with different badges. But to confirm we need pics. __________________ Edward.

13th Feb 2018, 11:44 pm	#6
ukcol Rest in Peace Join Date: May 2003 Location: Harlaxton, Lincolnshire, UK. Posts: 3,944	Re: Murphy A852G RP - service data The Murphy A862G uses a UCL82 and a UY85 like your A852G. The picture of the chassis in the Trader sheet for the A862G looks very much like your picture. The Trader sheet for the A862G is available here http://www.service-data.com/section.php/5166/1/a862g and in my opinion is certainly worth a punt. EDIT: I have just noticed that the Trader sheet calls the A862G the "Majorette" which fits in with Edward's suggestion above. Attached Thumbnails Last edited by ukcol; 13th Feb 2018 at 11:55 pm. Reason: Added sentence

14th Feb 2018, 12:51 am	#7
RojDW48 Nonode Join Date: Jun 2014 Location: Bristol, UK. Posts: 2,074	Re: Murphy A852G RP - service data Thank you very much Colin - that's the one - I probably mis-read the '6' as a 5 - my eyesight is not what it was . Interesting to know it was also marketed as a Bush - thanks, Edward. __________________ '....don't go mistaking Paradise for that home across the road!' (Bob Dylan)