radio's drifting because of weather ? - Page 2 - UK Vintage Radio Repair and Restoration Discussion Forum

gezza123 · 6th Dec 2010, 5:54 pm

HI. well done (Dave G8HQP)

you where right about C7 0.01uf in the Osc ,took it out and measured it @0.014uf so put in one that measured dead on 10nf.please correct me if wrong has this gone up 4000pf
Also measured C8 100pf that measured 104.5pf ,I heated it up on test no change so left it in.Set now @70% .
I supose this is about right for this set the drifting is very low now.

I will test all the caps in the front end when I get some more time,and replace if required.
Thanks for pointing me in the right direction, and thanks to the rest of the Guy's,and this wonderful site.Gezza

G8HQP Dave · 11th Dec 2010, 10:23 pm

It probably had some moisture in it. This makes the value go up, the leakage go up too, and more importantly for your situation the value will depend on temperature.

6th Dec 2010, 5:54 pm	#21
gezza123 Heptode Join Date: Mar 2010 Location: Eastham, Wirral, Merseyside, UK. Posts: 788	Re: radio's drifting because of weather ? HI. well done (Dave G8HQP) you where right about C7 0.01uf in the Osc ,took it out and measured it @0.014uf so put in one that measured dead on 10nf.please correct me if wrong has this gone up 4000pf Also measured C8 100pf that measured 104.5pf ,I heated it up on test no change so left it in.Set now @70% . I supose this is about right for this set the drifting is very low now. I will test all the caps in the front end when I get some more time,and replace if required. Thanks for pointing me in the right direction, and thanks to the rest of the Guy's,and this wonderful site.Gezza

11th Dec 2010, 10:23 pm	#22
G8HQP Dave Rest in Peace Join Date: Sep 2008 Location: Solihull, West Midlands, UK. Posts: 4,872	Re: radio's drifting because of weather ? It probably had some moisture in it. This makes the value go up, the leakage go up too, and more importantly for your situation the value will depend on temperature.