Identify capacitors? - UK Vintage Radio Repair and Restoration Discussion Forum

osx86apple · 25th Jan 2018, 9:20 pm

Any ideas? Manufactured by froylt and they look worse for wear.

ms660 · 25th Jan 2018, 9:33 pm

5nF, line to earth?

Lawrence.

Station X · 25th Jan 2018, 9:48 pm

They need to be Class Y in that position.

What set are they fitted in?

osx86apple · 25th Jan 2018, 11:07 pm

It's a Krechlok Kg golm radiogram, they are filtering out the mains so guessing class x? Can't find a circuit diagram for this model so proving tricky.

Station X · 25th Jan 2018, 11:10 pm

Class X goes across the mains (X is a cross)

Class Y goes from mains L and N to earth/chassis

osx86apple · 25th Jan 2018, 11:14 pm

Thank you, I could possibly get away with 4.7uf due to availability?

julie_m · 25th Jan 2018, 11:24 pm

If you mean 4.7nF, that will be fine

stevehertz · 26th Jan 2018, 12:01 am

And 1000V.

Maarten · 26th Jan 2018, 1:45 am

Quote:

Originally Posted by stevehertz

And 1000V.

1000V only if you use ordinary MKP or ceramics. If you use proper Y2 capacitors, which you should if they are to provide mains insulation (that is, between mains and chassis), those are measured in ACV. 275VAC is a common value nowadays, I wouldn't use anything below that.

osx86apple · 28th Jan 2018, 12:26 am

Thanks for the replies. Any recommendations on what to get? I've always used rs components in the past.

Herald1360 · 28th Jan 2018, 10:57 am

Something like this?

http://uk.farnell.com/epcos/b32021a3...rad/dp/1609517

(RS website down at the mo)

osx86apple · 28th Jan 2018, 6:05 pm

Thank you, I find those a little tricky to install being a pcb mounted type capacitor, any ideas?

Station X · 28th Jan 2018, 6:10 pm

I can't actually see any capacitors on that circuit diagram which would need to be Class X or Class Y types.

Are we still talking about the same capacitors?

EDIT, I guess we're talking about C156 and C157? Depending on the voltage on the secondary winding of the mains transformer, 275VAC Class Y capacitors may not have a high enough voltage rating. 1000VDC polypropylene types are generally rated at 400VAC and should do the job. They're available with axial leads too.

osx86apple · 28th Jan 2018, 6:21 pm

Sorry, yes these are being directly fed to the rectifier

Herald1360 · 28th Jan 2018, 6:25 pm

If it is C156/7 then yellow axial 1000V types will be fine (and easy to fit).

Like this: http://uk.farnell.com/lcr-components...ial/dp/9520309

25th Jan 2018, 9:20 pm	#1
osx86apple Pentode Join Date: Dec 2014 Location: Torquay, Devon, UK. Posts: 148	Identify capacitors? Any ideas? Manufactured by froylt and they look worse for wear. Attached Thumbnails

25th Jan 2018, 9:33 pm	#2
ms660 Dekatron Join Date: Apr 2011 Location: Cornwall, UK. Posts: 13,454	Re: Identify capacitors? 5nF, line to earth? Lawrence.

25th Jan 2018, 9:48 pm	#3
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Identify capacitors? They need to be Class Y in that position. What set are they fitted in? __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

25th Jan 2018, 11:07 pm	#4
osx86apple Pentode Join Date: Dec 2014 Location: Torquay, Devon, UK. Posts: 148	Re: Identify capacitors? It's a Krechlok Kg golm radiogram, they are filtering out the mains so guessing class x? Can't find a circuit diagram for this model so proving tricky.

25th Jan 2018, 11:10 pm	#5
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Identify capacitors? Class X goes across the mains (X is a cross) Class Y goes from mains L and N to earth/chassis __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

25th Jan 2018, 11:14 pm	#6
osx86apple Pentode Join Date: Dec 2014 Location: Torquay, Devon, UK. Posts: 148	Re: Identify capacitors? Thank you, I could possibly get away with 4.7uf due to availability?

25th Jan 2018, 11:24 pm	#7
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Identify capacitors? If you mean 4.7nF, that will be fine __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.

26th Jan 2018, 12:01 am	#8
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,833	Re: Identify capacitors? And 1000V. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

28th Jan 2018, 12:26 am	#10
osx86apple Pentode Join Date: Dec 2014 Location: Torquay, Devon, UK. Posts: 148	Re: Identify capacitors? Thanks for the replies. Any recommendations on what to get? I've always used rs components in the past.

28th Jan 2018, 10:57 am	#11
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Identify capacitors? Something like this? http://uk.farnell.com/epcos/b32021a3...rad/dp/1609517 (RS website down at the mo) __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O

28th Jan 2018, 6:05 pm	#12
osx86apple Pentode Join Date: Dec 2014 Location: Torquay, Devon, UK. Posts: 148	Re: Identify capacitors? Thank you, I find those a little tricky to install being a pcb mounted type capacitor, any ideas? Attached Thumbnails

28th Jan 2018, 6:10 pm	#13
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Identify capacitors? I can't actually see any capacitors on that circuit diagram which would need to be Class X or Class Y types. Are we still talking about the same capacitors? EDIT, I guess we're talking about C156 and C157? Depending on the voltage on the secondary winding of the mains transformer, 275VAC Class Y capacitors may not have a high enough voltage rating. 1000VDC polypropylene types are generally rated at 400VAC and should do the job. They're available with axial leads too. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

28th Jan 2018, 6:21 pm	#14
osx86apple Pentode Join Date: Dec 2014 Location: Torquay, Devon, UK. Posts: 148	Re: Identify capacitors? Sorry, yes these are being directly fed to the rectifier

28th Jan 2018, 6:25 pm	#15
Herald1360 Dekatron Join Date: Feb 2007 Location: Leominster, Herefordshire, UK. Posts: 16,536	Re: Identify capacitors? If it is C156/7 then yellow axial 1000V types will be fine (and easy to fit). Like this: http://uk.farnell.com/lcr-components...ial/dp/9520309 __________________ ....__________ ....\|____\|\|__\|__\_____ .=.\| _---\__\|__\|_---_\|. .........O..Chris....O