Vidor CN359 - UK Vintage Radio Repair and Restoration Discussion Forum

line sync · 8th Feb 2019, 12:33 pm

A good friend of mine saved this radio from going to the tip and has done a lovely job of re finishing the cabinet.
He asked me if I could look at the chassis as it didn`t work very well.
well I offered to take it away and repair it for free as been as it was just about working.
Well after changing the usual wax caps , electrolytic,s and an o/c 100k resistor , I found the tone control was o/c.
On removing the tone pot ( which was not the original ) I noticed that there was a burn mark on the chassis where the original tone pot had burnt out.
Now this pot is 50k with a .05uf cap on the wiper and usually a tone pot has a higher resistance than this.
Now unfortunately my bvws trader sheet cd which would probably have this information on is cracked and will not play so I am hoping some kind person can confirm the correct value of this pot and possible capacitor.
The sound o/p valve is unusual in being a 6AG6 .

Robin

jonnybear · 8th Feb 2019, 12:49 pm

Pot is a 50k cap is .05 (.047uf)needs to be high voltage.
John

line sync · 9th Feb 2019, 10:09 am

Thank you john that's a great help.
Can anyone confirm the 6AG6 valve is correct ?

Robin

snowman_al · 9th Feb 2019, 10:19 am

Look here: https://www.radiomuseum.org/r/vidor_cn359.html

According to the above, originally it would have been an EL33.
A 6AG6 (or KT61) is a sensible replacement.

Alan

Nanozeugma · 9th Feb 2019, 2:47 pm

As John has previously remarked, a capacitor in that position should be rated at 1Kv I would suggest.

8th Feb 2019, 12:33 pm	#1
line sync Heptode Join Date: Sep 2009 Location: Kinver, Staffordshire, UK. Posts: 634	Vidor CN359 A good friend of mine saved this radio from going to the tip and has done a lovely job of re finishing the cabinet. He asked me if I could look at the chassis as it didn`t work very well. well I offered to take it away and repair it for free as been as it was just about working. Well after changing the usual wax caps , electrolytic,s and an o/c 100k resistor , I found the tone control was o/c. On removing the tone pot ( which was not the original ) I noticed that there was a burn mark on the chassis where the original tone pot had burnt out. Now this pot is 50k with a .05uf cap on the wiper and usually a tone pot has a higher resistance than this. Now unfortunately my bvws trader sheet cd which would probably have this information on is cracked and will not play so I am hoping some kind person can confirm the correct value of this pot and possible capacitor. The sound o/p valve is unusual in being a 6AG6 . Robin

8th Feb 2019, 12:49 pm	#2
jonnybear Octode Join Date: Nov 2010 Location: Cullompton, Devon, UK. Posts: 1,435	Re: vidor cn359 Pot is a 50k cap is .05 (.047uf)needs to be high voltage. John

9th Feb 2019, 10:09 am	#3
line sync Heptode Join Date: Sep 2009 Location: Kinver, Staffordshire, UK. Posts: 634	Re: Vidor CN359 Thank you john that's a great help. Can anyone confirm the 6AG6 valve is correct ? Robin

9th Feb 2019, 10:19 am	#4
snowman_al Octode Join Date: Dec 2018 Location: Llandeilo, West Wales, UK. Posts: 1,092	Re: Vidor CN359 Look here: https://www.radiomuseum.org/r/vidor_cn359.html According to the above, originally it would have been an EL33. A 6AG6 (or KT61) is a sensible replacement. Alan __________________ Never Leave Well Enough Alone...

9th Feb 2019, 2:47 pm	#5
Nanozeugma Heptode Join Date: Nov 2017 Location: London, UK. Bury, Lancashire quite regularly :) Posts: 611	Re: Vidor CN359 As John has previously remarked, a capacitor in that position should be rated at 1Kv I would suggest. __________________ Thermionic Emission, warms the cockles of your tubes.