Help Identifying a Capacitor Pinouts Please! - UK Vintage Radio Repair and Restoration Discussion Forum

Becky-C · 26th Mar 2015, 12:43 pm

Hi Guys (And Gals!)

I'm having problems finding a pinout for this capacitor, as I need to replace it from the power supply on a GEC Model Number G974 as I'm getting a lot of hum through the amplifier causing distortion. Plus I thought it was a good idea to replace the caps anyway..

Have added some pics, but the capacitor is Marked
C.C.L
Electrolytic Capacitor
50+50+8uF
275 V D C WKG
350 V SURGE
PN 73
K4

Thanks in advance!!

Becky

Station X · 26th Mar 2015, 12:58 pm

One tag will be a common negative and the other three tags will be the positive sides of the three capacitors within the can. You should be able to work out which is which by tracing the wires you disconnected from the can and referring to the circuit diagram.

However it hardly matters because a new can, if you can find one, should be clearly marked as to which tag is which. It's more likely that you'll have to fit three separate caps on a tag strip or restuff the can.

Station X · 26th Mar 2015, 1:03 pm

On looking at the service sheet I see that this set uses a printed circuit board (PCB) so you'll have to trace tracks rather than wires.

Becky-C · 26th Mar 2015, 1:59 pm

Thanks Graham
I was going to use separate electrolytics, as I can't find a replacement can, nor any data sheets for it.
I don't suppose the service sheet gives the values for C49, C50 & C51

Thanks

Becky

'LIVEWIRE?' · 26th Mar 2015, 2:25 pm

A german firm www.askjanfirst.de stocks some triple electrolytics, and may list 47 + 47 +10uf 350v cans, which should be adequate as a replacement, provided the pinouts are similar to the original. The service sheet should give values for all components.

Station X · 26th Mar 2015, 2:46 pm

Quote:

Originally Posted by Becky-C

Thanks Graham
I was going to use separate electrolytics, as I can't find a replacement can, nor any data sheets for it.
I don't suppose the service sheet gives the values for C49, C50 & C51

Thanks

Becky

8uF, 50uF and 50uF as you'd expect, in that order.

26th Mar 2015, 4:35 pm

I reckon the fat tag is the common negative.

Boater Sam · 26th Mar 2015, 6:50 pm

It will probably be easier and more original if you re-stuff the can. Getting the 3 capacitors inside should be no problem, new ones are tiny compared with the originals. Then you have the same connections onto the pcb too.
I usually cut the can in two near the bottom with a pipe cutter, its then easy to disguise the cut with a band of tape. Or you could unpick the rubber bung from the bottom. There are now 10mm diametre capacitors that can be installed in the can simply by drilling a hole to fit it into. There will be room for all 3 to be fitted.

Refugee · 26th Mar 2015, 8:44 pm

Those 10mm capacitors work well and are at there best in sets with a nice heavy chassis that does not move while you are drilling. The mounting clip remains untouched.
With a PCB mounted part the wiring can be routed and the recess where the bung is filled with epoxy to keep the wires in the correct places to line up with the holes in the PCB. If these are too big they can be covered with a bit of a chopped up solder tag to finish it off neatly.
Mount the capacitor in a mounting clip with the nuts facing down and nip them in a vice while drilling and add a 10mm dowel or peg in the first and second holes as you work so that the old part inside does not shift if the old rivets snag while drilling. A bad snag will dent the new capacitor if that is used as a dowel so don;t be tempted.
Good branded parts are under £2 each from bigger British suppliers.
I did a thread with photos and supplier details a while ago.

Diabolical Artificer · 27th Mar 2015, 7:42 am

You could also use a good quality 50/50u large cap, like an F+T with an 8u Vishay under the PCB. Your can at a guess is fat tag - 50/50 to each side with the 8u at the top. A cap meter should tell you if you have one.

Make sure any replacement cap/s you get has an adequate ripple rating; some cheaper caps are useless as filter/reservoir caps. It's worth getting the best caps you can as these are what your listening to.

Watford Valves or the British Wireless chaps (sorry forgotten correct acronym- BVWS ?) should have a dual 50/50u F+T, Audiocap should have a F+T 8u single cap.

Andy.

Becky-C · 31st Mar 2015, 10:21 am

Thanks for the info and help Guys.
Sorry for the delay in responding, real life keeps getting in the way!

Becky

26th Mar 2015, 12:43 pm	#1
Becky-C Triode Join Date: Jul 2013 Location: Towcester, Northamptonshire, UK. Posts: 19	Help Identifying a Capacitor Pinouts Please! Hi Guys (And Gals!) I'm having problems finding a pinout for this capacitor, as I need to replace it from the power supply on a GEC Model Number G974 as I'm getting a lot of hum through the amplifier causing distortion. Plus I thought it was a good idea to replace the caps anyway.. Have added some pics, but the capacitor is Marked C.C.L Electrolytic Capacitor 50+50+8uF 275 V D C WKG 350 V SURGE PN 73 K4 Thanks in advance!! Becky Attached Thumbnails

26th Mar 2015, 12:58 pm	#2
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Help Identifying a Capacitor Pinouts Please! One tag will be a common negative and the other three tags will be the positive sides of the three capacitors within the can. You should be able to work out which is which by tracing the wires you disconnected from the can and referring to the circuit diagram. However it hardly matters because a new can, if you can find one, should be clearly marked as to which tag is which. It's more likely that you'll have to fit three separate caps on a tag strip or restuff the can. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

26th Mar 2015, 1:03 pm	#3
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,289	Re: Help Identifying a Capacitor Pinouts Please! On looking at the service sheet I see that this set uses a printed circuit board (PCB) so you'll have to trace tracks rather than wires. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

26th Mar 2015, 1:59 pm	#4
Becky-C Triode Join Date: Jul 2013 Location: Towcester, Northamptonshire, UK. Posts: 19	Re: Help Identifying a Capacitor Pinouts Please! Thanks Graham I was going to use separate electrolytics, as I can't find a replacement can, nor any data sheets for it. I don't suppose the service sheet gives the values for C49, C50 & C51 Thanks Becky

26th Mar 2015, 2:25 pm	#5
'LIVEWIRE?' Rest in Peace Join Date: Mar 2006 Location: N.W. Oxfordshire(Chipping Norton) Posts: 7,306	Re: Help Identifying a Capacitor Pinouts Please! A german firm www.askjanfirst.de stocks some triple electrolytics, and may list 47 + 47 +10uf 350v cans, which should be adequate as a replacement, provided the pinouts are similar to the original. The service sheet should give values for all components.

26th Mar 2015, 4:35 pm	#7
Guest Guest Posts: n/a	Re: Help Identifying a Capacitor Pinouts Please! I reckon the fat tag is the common negative.

26th Mar 2015, 6:50 pm	#8
Boater Sam Banned Join Date: Dec 2013 Location: Middlewich, Cheshire, UK. & Winter in the Philippines. Posts: 3,897	Re: Help Identifying a Capacitor Pinouts Please! It will probably be easier and more original if you re-stuff the can. Getting the 3 capacitors inside should be no problem, new ones are tiny compared with the originals. Then you have the same connections onto the pcb too. I usually cut the can in two near the bottom with a pipe cutter, its then easy to disguise the cut with a band of tape. Or you could unpick the rubber bung from the bottom. There are now 10mm diametre capacitors that can be installed in the can simply by drilling a hole to fit it into. There will be room for all 3 to be fitted.

26th Mar 2015, 8:44 pm	#9
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: Help Identifying a Capacitor Pinouts Please! Those 10mm capacitors work well and are at there best in sets with a nice heavy chassis that does not move while you are drilling. The mounting clip remains untouched. With a PCB mounted part the wiring can be routed and the recess where the bung is filled with epoxy to keep the wires in the correct places to line up with the holes in the PCB. If these are too big they can be covered with a bit of a chopped up solder tag to finish it off neatly. Mount the capacitor in a mounting clip with the nuts facing down and nip them in a vice while drilling and add a 10mm dowel or peg in the first and second holes as you work so that the old part inside does not shift if the old rivets snag while drilling. A bad snag will dent the new capacitor if that is used as a dowel so don;t be tempted. Good branded parts are under £2 each from bigger British suppliers. I did a thread with photos and supplier details a while ago.

27th Mar 2015, 7:42 am	#10
Diabolical Artificer Dekatron Join Date: Jul 2009 Location: Sleaford, Lincs. UK. Posts: 7,670	Re: Help Identifying a Capacitor Pinouts Please! You could also use a good quality 50/50u large cap, like an F+T with an 8u Vishay under the PCB. Your can at a guess is fat tag - 50/50 to each side with the 8u at the top. A cap meter should tell you if you have one. Make sure any replacement cap/s you get has an adequate ripple rating; some cheaper caps are useless as filter/reservoir caps. It's worth getting the best caps you can as these are what your listening to. Watford Valves or the British Wireless chaps (sorry forgotten correct acronym- BVWS ?) should have a dual 50/50u F+T, Audiocap should have a F+T 8u single cap. Andy. __________________ Curiosity hasn't killed this cat...so far.

31st Mar 2015, 10:21 am	#11
Becky-C Triode Join Date: Jul 2013 Location: Towcester, Northamptonshire, UK. Posts: 19	Re: Help Identifying a Capacitor Pinouts Please! Thanks for the info and help Guys. Sorry for the delay in responding, real life keeps getting in the way! Becky