Replacing a 40 uf + 20 uf 500 V can capacitor - UK Vintage Radio Repair and Restoration Discussion Forum

allyson114 · 8th Nov 2021, 6:45 pm

Good evening. As the heading says Terry wants to replace the above on a jukebox valve amplifier and would like to mount the replacement on the top of the chassis as per the original. The nearest replacement we can find is 32 + 16 uf 500 v, would this be suitable or are there any suggestions from you clever people as we can't seem to find anything nearer to the original value?

Radio Wrangler · 8th Nov 2021, 7:03 pm

If you look at the tolerance spec on the old part, if the new part is close to what it's marked as, it will likely be within bounds.

Modern capacitors are made somewhat more accurately.

Should be fine.

David

stevehertz · 8th Nov 2021, 7:19 pm

If it bothers you just fit extra capacitors under the chassis to make up the old values. But my view is that you won't hear a difference. Worry ye not.

snowman_al · 8th Nov 2021, 7:20 pm

I think a bit more information would be helpful.
Size - diameter and height are they important?
What rectifier does the 'box use - valve or solid state?
What is the maximum voltage on the HT+ rail?
Could the original can be restuffed etc.?

theoldtrout · 8th Nov 2021, 8:26 pm

You can buy them from CE Distribution in the USA - at a price. We leave the originals in place to preserve appearance and put modern caps on tag strips underneath the chassis.

8th Nov 2021, 6:45 pm	#1
allyson114 Triode Join Date: Nov 2016 Location: Pluckley, near Ashford, Kent, UK. Posts: 23	Replacing a 40 uf + 20 uf 500 V can capacitor Good evening. As the heading says Terry wants to replace the above on a jukebox valve amplifier and would like to mount the replacement on the top of the chassis as per the original. The nearest replacement we can find is 32 + 16 uf 500 v, would this be suitable or are there any suggestions from you clever people as we can't seem to find anything nearer to the original value?

8th Nov 2021, 7:03 pm	#2
Radio Wrangler Moderator Join Date: Mar 2012 Location: Fife, Scotland, UK. Posts: 22,901	Re: Replacing a 40 uf + 20 uf 500 V can capacitor If you look at the tolerance spec on the old part, if the new part is close to what it's marked as, it will likely be within bounds. Modern capacitors are made somewhat more accurately. Should be fine. David __________________ Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done

8th Nov 2021, 7:19 pm	#3
stevehertz Dekatron Join Date: Sep 2011 Location: Rugeley, Staffordshire, UK. Posts: 8,834	Re: Replacing a 40 uf + 20 uf 500 V can capacitor If it bothers you just fit extra capacitors under the chassis to make up the old values. But my view is that you won't hear a difference. Worry ye not. __________________ A digital radio is the latest thing, but a vintage wireless is forever..

8th Nov 2021, 7:20 pm	#4
snowman_al Octode Join Date: Dec 2018 Location: Llandeilo, West Wales, UK. Posts: 1,092	Re: Replacing a 40 uf + 20 uf 500 V can capacitor I think a bit more information would be helpful. Size - diameter and height are they important? What rectifier does the 'box use - valve or solid state? What is the maximum voltage on the HT+ rail? Could the original can be restuffed etc.? __________________ Never Leave Well Enough Alone...

8th Nov 2021, 8:26 pm	#5
theoldtrout Hexode Join Date: Sep 2008 Location: Charlton Mackrell, Somerset, UK. Posts: 315	Re: Replacing a 40 uf + 20 uf 500 V can capacitor You can buy them from CE Distribution in the USA - at a price. We leave the originals in place to preserve appearance and put modern caps on tag strips underneath the chassis.