Quick cap question

[PhilDick]

I thought I better replace the potentialy knackered caps in my bolt down nap250. It was serviced in 2006 so I was only going to replace the two 10uf caps on the reg boards. Is this the correct part:

https://uk.farnell.com/vishay/mal211838109e3/cap-10-f-63v-20-through-hole/dp/1695288?st=10uF 63V Vishay BC axial

 

[martin clark]

Yes, those are a a great choice, will work well.

 

[PhilDick]

Thanks Martin.

 

[Gervais Cote]

Both Vishay and Nichicon make good axial capacitors. Often better than the originals that were installed at the factory.

 

[PhilDick]

I see this Nichicon one on Farnell which is far cheaper:

https://uk.farnell.com/nichicon/tvx...-20/dp/8823740?ost=Nichicon+VX+10uF+63V+axial

Would that do too? Price diff makes me suspicious although it is recommended on here.

While I'm on where can I get the other caps on the boards from (the 47 uF/40V Promisic (Felsic) ones or alternatives). I know I should change these too whilst I have the boards out.

 

[MJS]

The 10uF/63v axial is the single most troublesome cap in the entire amp. No real need to change the others but if you've got the boards out then choose the 47uF from the same range - it doesn't have to be bipolar. If it's a bolt-down it's worth changing the zeners too as they're probably very noisy.

 

[Mike P]

Nichicon VX are good quality, they'll be fine.

 

[PhilDick]

The 10uF/63v axial is the single most troublesome cap in the entire amp. No real need to change the others but if you've got the boards out then choose the 47uF from the same range - it doesn't have to be bipolar. If it's a bolt-down it's worth changing the zeners too as they're probably very noisy.

Hi Mark,

It did have a full Naim service in 2006. Would you still recommend changing the diodes?

 

[337alant]

The Kemet Peg axial series are excellent, low ESR and very long life but are 29mmL and 10mm Dia
https://uk.rs-online.com/web/p/aluminium-capacitors/1731868/
But do you really need axial?, could you not just use radial ?, something like Nichicon FG 10uf x 50V are really small but have long leads
https://www.mouser.co.uk/Nichicon/P...FG-Series/_/N-75hqw?P=1yi2tfgZ1z0zlbmZ1z0wrkr

Alan

 

[PhilDick]

Hi Alan,

I believe (from what I've read) that the ESR value is quite important on this cap. So low is not good. Not sure about putting radials in, don't want it to look bodged.

 

[337alant]

Ah yes sorry its after the reg, well why no just go with your original Vishay link the 10uf x 63v has 11 ohms ESR

Alan

 

[MJS]

Hi Mark,
It did have a full Naim service in 2006. Would you still recommend changing the diodes?

They probably did them with the service if it was excessively noisy, so you can leave them in.

 

[Dowser]

Just check PCB to see if they have been resoldered?