Capacitor identification request - UK Vintage Radio Repair and Restoration Discussion Forum

Ken Taylor · 5th Mar 2021, 3:52 pm

I really just want an idea of the working voltage, so I can replace a screen grid decoupler with it. I cannot find the manufacturers symbol in any listing - it's pretty old, probably from Decca Navigator days. It does still read 3000pF.

Thanks

Ken Taylor · 15th Mar 2021, 12:14 pm

Oh well - I'll just have to try it.
Thread can be closed - thanks.
Ken

Radio Wrangler · 15th Mar 2021, 3:49 pm

2% suggests it's mica.

the voltage rating could be anybody's guess but maybe 150-250v. It's a type usually used in RF/IF tuned circuits, only seeing signal voltages and far too expensive for something as humdrum as screen decoupling.

Save it and go with a disc ceramic.

David

5th Mar 2021, 3:52 pm	#1
Ken Taylor Pentode Join Date: Dec 2015 Location: Abingdon on Thames, Oxon, UK. Posts: 116	Capacitor identification request I really just want an idea of the working voltage, so I can replace a screen grid decoupler with it. I cannot find the manufacturers symbol in any listing - it's pretty old, probably from Decca Navigator days. It does still read 3000pF. Thanks Attached Thumbnails

15th Mar 2021, 12:14 pm	#2
Ken Taylor Pentode Join Date: Dec 2015 Location: Abingdon on Thames, Oxon, UK. Posts: 116	Re: Capacitor identification request Oh well - I'll just have to try it. Thread can be closed - thanks. Ken

15th Mar 2021, 3:49 pm	#3
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,875	Re: Capacitor identification request 2% suggests it's mica. the voltage rating could be anybody's guess but maybe 150-250v. It's a type usually used in RF/IF tuned circuits, only seeing signal voltages and far too expensive for something as humdrum as screen decoupling. Save it and go with a disc ceramic. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done