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One of the capacitors is leaking on the rectifier board of my BC9500, and I'd like to replace all four (these are the 4 big power filtering capacitors).
The capacitors are:
2 x 6800 µF 40v (ROE) DIN 41253 EGD-40,105C (one of these is leaking)
1 x 2200 µF 40V
1 x 10000 µF 25v
The dimensions for the leaking capacitor (one of the 6800 µF) are 25 mm wide by 40 mm high. The capacitors are chassis mount (also known as panel mount, I think).
Unfortunately as Menahem detailed here http://archivedarchivedforum2.beoworld.org/forums/t/21082.aspx it looks like the manufacturer (now owned by Vishay) does not make this series any more. The closest match I can find from Vishay is from this sheet:
http://www.vishay.com/docs/28342/058059pl.pdf
Where 57682E3 and 47682E3 are the closest. However, the 25 mm wide 47682E3 is 50 mm high - 10 mm more than the existing capacitor. Due to the way they are mounted, larger capacitors will simply not fit.
Has anyone replaced their power capacitors? Did you find a replacement that was appropriate, and yet also fitted? Any ideas about this?
Any help appreciated!
Here is a Nichicon 35 x 40 63V, they have a 50V 25 x 40, no 40 V but you can go higher with the Voltage no problem, I have changed several big caps with Nichicon as they normally has the dimensions that comes closest to the original, if you have more Roederstein caps in the unit, change them as well, and go one step up in voltage.
Collecting Vintage B&O is not a hobby, its a lifestyle.
Thank you for the reply. I did not check the unit for more caps - and due to location can't check it for a few weeks. My mistake.
Hopefully replacing these four caps will be enough, at least as a starting point. I do not recall any other large ones.
Would you say these would be appropriate replacements?
http://www.x-on.com.au/InventoryDetails.aspx?id=594794&s=1
http://www.x-on.com.au/InventoryDetails.aspx?id=594804&s=1
http://www.x-on.com.au/InventoryDetails.aspx?id=594742&s=1
I'm hopeful the lead spacing will allow them to be soldered in without modification. They are all similarly rated (some have higher voltage ratings than the capacitors they are replacing).
alchemy:Would you say these would be appropriate replacements?
As the dimensions are important here, I would use them, they are 85 degrees, I use 105 degrees if I can get them.
With the unit correctly adjusted and working normally there will never be a problem with the temp. rating. The producers promises longer lifetime on the 105 degrees, that in a B&O would mean 30 instead of 25 years
Thank you for the reply. Nichicon doesn't seem to produce a 105 C capacitor suiting the dimensions, although some other manufacturers do (but these are not all audio rated).
I guess an 85C nichicon audio grade capacitor rated at a higher voltage than the original is better than an 105C capacitor of an unreliable manufacturer. Unless there is an alternative brand or replacement strategy.
Forget about audio rating and go for the 105C models. These are power supply filtering caps, and qualities that aren't needed will be totally wasted in that application. "Audio grade" specs don't help you at all when you are replacing prematurely failing 85C caps in the future.
I always use 105C caps in places that get hot/warm. The durability given on the data sheets may sound generous, but they are given in normal conditions. Caps will degrade a lot faster than that once the temperature rises (not just due to the environment, but from the caps itself doing their job and getting warm) and in certain applications an 85C cap can die in a couple of years because they are operating much closer to their limit.
Probably not in this case though - I suppose that if the originals are 85C, modern replacements may well last for the remaining life of the 9500. Consider this a general lecture
--mika