WTB 25uF 100v radial capacitors X 4

[TheFinisher]

I can’t find the above anywhere so I thought I’d ask on here .

Thanks
Andy
Uk based

 

[amplidude]

Dimensions would help...

 

[asuslover]

22uf should be fine, I don’t remember from the top of my head , but some brands of capacitors tend to run higher that the listed value.

 

[TheFinisher]

Dimensions would help...

Without opening it up again to look I’d say 25mm x 10/12mm .
Bottom right in photo ( of course I can open it up again if needed)

 

[amplidude]

Are theese back to back input coupling capacitors? Close proximity to what appears to be some in/output

 

[asuslover]

Looks that way.

 

[TheFinisher]

Are theese back to back input coupling capacitors? Close proximity to what appears to be some in/output

They are at the preamp output RCA’s

 

[batteryman]

Uou could replace each pair with one Nichicon Muse bipolar capacitor. (audio grade).
25uf is amight big value for a coupling capacitor. What is it driving: must be quite low impedance.

https://www.nichicon.co.jp/english/products/pdf/e-es.pdf

 

[amplidude]

Or go with polypropylene.. I would

 

[amplidude]

What's the input impedance of the amplifier you will connect?

 

[TheFinisher]

No idea , this and the monoblocks that go with the preamp were made in 1994 , no schematics available.
It works fine, just thought I’d recap it given its age .
I did use it with the stasis 2 for a while

 

[TheFinisher]

Uou could replace each pair with one Nichicon Muse bipolar capacitor. (audio grade).
25uf is amight big value for a coupling capacitor. What is it driving: must be quite low impedance.

https://www.nichicon.co.jp/english/products/pdf/e-es.pdf

Yes that would be after exhausting all other options 👍🏻

 

[amplidude]

If your power amps have capacitor input coupling, the you could simply bypass the ones in your preamp, but if you change alot around, or sell it could get ugly.
If it was my preamp I would measure before coupling caps, to see if dc is present.

 

[amplidude]

If they are back to back they behave like a bipolar already

 

[TheFinisher]

Good point 😁
So if they are back to back I take it that I could replace the 4 with 2x 50uf and fit a link ?
From what I can see they are fitted …
Negative to negative

 

[theAnonymous1]

Two 25uF caps in series is equivalent to 12.5uF, not 50uF. Personally, I would just throw a 50V 22uF Muse on each output. You can argue they aren't as good as film, but they're surely better than what's in there.

https://www.mouser.co.uk/ProductDetail/Nichicon/UES1H220MPM?qs=kArNe9LFxXnVL/dGGSgrjw==

 

[amplidude]

Or two nice polypropylene, 10uf should cover most. Beats every electrolytic capacitor

 

[Michael Bean]

For coupling audio circuits together (not power supply de-coupling), a quality bi-polar electrolytic scaled correctly will work just as well as a polypropylene cap in that application. The afore mentioned Nichicon Muse work very well for coupling applications...when scaled correctly.

Mike

 

[batteryman]

Yes that would be after exhausting all other options 👍🏻

Lots to choose from here:

https://www.hificollective.co.uk/

No need for 100v ones either I expect. 50v should be mroe than adequate.

 

[TheFinisher]

I wouldn’t have a clue .
I find hard to believe that capacitors aren’t available in those values