Ultra 6816 portable Thorn BRC - UK Vintage Radio Repair and Restoration Discussion Forum

bionicmerlin · 18th Aug 2019, 9:05 pm

We had one of these sets when I was younger Infact it was a grey Marconi. I actually like this white one better . It works well apart from I can’t get the linearity just right. I’m probably being a bit fussy and I might leave it as it is unless I’m missing something? . The picture appears to be very slightly stretched on the left slightly increasing after about 5 mins then staying stable.
It also has poor sound but that’s the speaker and I have a spare one .
Any ideas . Thanks Andy

Tractionist · 18th Aug 2019, 10:16 pm

I think that the white coloured versions were called Ultra 'Bermudas' ?

KeithsTV · 18th Aug 2019, 11:50 pm

Boots also sold a version with a white cabinet.

I've had the Ferguson version since 1976 and recently had to change the speaker. I've also had a dry joint on one of the rectifiers which caused a hum bar. Apart from those faults it's been a reliable TV.

Keith

Restoration73 · 19th Aug 2019, 9:14 am

Try reducing height and adjust for best linearity - it might help to move the raster using
the picture shift magnets. I remember this sometimes helped with the teletext lines.

Check the AC187/188 o/p pair (later versions had silicon) if the speaker is OK.

I have noted the plastics used on Thorn sets can become brittle. (1590/91 chassis)

bionicmerlin · 19th Aug 2019, 8:14 pm

Thanks for the info guys. I will have a better play about to see if I can get it any better thanks Tony for the technical advice Andy

18th Aug 2019, 9:05 pm	#1
bionicmerlin Heptode Join Date: May 2010 Location: Warminster, Wiltshire, UK. Posts: 682	Ultra 6816 portable Thorn BRC We had one of these sets when I was younger Infact it was a grey Marconi. I actually like this white one better . It works well apart from I can’t get the linearity just right. I’m probably being a bit fussy and I might leave it as it is unless I’m missing something? . The picture appears to be very slightly stretched on the left slightly increasing after about 5 mins then staying stable. It also has poor sound but that’s the speaker and I have a spare one . Any ideas . Thanks Andy Attached Thumbnails

18th Aug 2019, 10:16 pm	#2
Tractionist Heptode Join Date: Apr 2016 Location: Cheltenham, Gloucestershire, UK. Posts: 874	Re: Ultra 6816 portable Thorn BRC I think that the white coloured versions were called Ultra 'Bermudas' ? __________________ Red to red, black to black. Throw the switch and stand well back!

18th Aug 2019, 11:50 pm	#3
KeithsTV Nonode Join Date: Aug 2007 Location: South Bradford, West Yorkshire, UK. Posts: 2,573	Re: Ultra 6816 portable Thorn BRC Boots also sold a version with a white cabinet. I've had the Ferguson version since 1976 and recently had to change the speaker. I've also had a dry joint on one of the rectifiers which caused a hum bar. Apart from those faults it's been a reliable TV. Keith

19th Aug 2019, 9:14 am	#4
Restoration73 Nonode Join Date: Jun 2013 Location: Surbiton, SW London, UK. Posts: 2,801	Re: Ultra 6816 portable Thorn BRC Try reducing height and adjust for best linearity - it might help to move the raster using the picture shift magnets. I remember this sometimes helped with the teletext lines. Check the AC187/188 o/p pair (later versions had silicon) if the speaker is OK. I have noted the plastics used on Thorn sets can become brittle. (1590/91 chassis)

19th Aug 2019, 8:14 pm	#5
bionicmerlin Heptode Join Date: May 2010 Location: Warminster, Wiltshire, UK. Posts: 682	Re: Ultra 6816 portable Thorn BRC Thanks for the info guys. I will have a better play about to see if I can get it any better thanks Tony for the technical advice Andy