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I'm currently restoring a Beocord 9000 and as I have some € left on a Mouser order for free shipping I figured I would order the parts to replace the electrolytic caps. Do you guys have any specific tips with regard to part selection? Some specific questions:
- I have trouble finding a replacement capacitor for the 5000uF cap on the rectifier board (C3). Would a 4700uF 50V cap be ok?
- Should I try to replace all capacitors with low ESR 105c high temp versions? Or are there specific areas where low ESR caps are suboptimal?
- Is it ok to replace capacitors with slightly higher max voltage versions to increase reliability? Or should I stick as much as possible to the listed max. voltage?
Any help would be appreciated.
Hello!
4700 µF is the correct value.
No need to shell out on exotic capacitors, plain Elna or Panasonic ones (avoid cheap Chinese caps like Lelon though) will do just fine.
As regards voltage, you may choose 35 V caps to replace 16 V ones for instance, but it depends on their position in the circuit. That said, will it still be used in 20 years ?
Jacques
Thanks!
If you use Panasonic caps, type FC or FR, you get the best possible quality.
Usually a 105 degree type has a some more lifetime than a normal 85 degree type, but it depends on the manufactorer.
A FR or FC from Panasonic is specified with around 5000 till 10.000 hours of use at this temperature... this is more than enough.
I do not recomend low esr types in the sound path. They will work for a long time, but you can hear the difference to original. They do not sound good.
If you replace caps in the sound path: use the normal types. Use micro sized caps.
Better: use WIMA MKS 5% polyester or Polysryrene caps. There is a antimagnetic 5% type on the market. They sound very good.