Sansui 9090 recap part list
- Thread starter jervz
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Nichicon UFG are audio grade capacitors which in my opinion are not suitable for all electrolytic capacitor positions in any amplifier or receiver. Different capacitor positions have different requirements, some need to be 'low ESR' types, others low leakage, the ones in the PSU or anywhere that gets particularly warm should be 105°C types (rather than 85°C which is fine for cooler areas), and the PSU located ones will also need to be low ESR as well. Some locations can use audio grade types, but this is only a small percentage of the total. There are 'capacitor kits' available on the Internet, these are frowned upon here, because often they provide incorrect capacitor types, and there are sometimes mistakes with values/voltages. And there is the possibility that they may be 'time expired' stock and not fresh from the manufacturers. Their use seems to promote the idea that all you need to do to achieve sonic nirvana with your treasured piece, is to change the electrolytic capacitors - not true - there is a lot more to it than that. Also recapping is NOT a repair procedure - in other words if you have a fault with your unit you should fix the fault first and not assume that a capacitor change will fix everything - it won't.
There are numerous restore threads here on AK some of which give listings of the parts used, I am not sure if there is one for the 9090, a search might reveal some threads.
All the information you need, such as capacitor manufacturers and types, and where to get them, advice on how to approach a restore and a great deal of other information is right here on AK, all you have to do is look for it and read.
Thread example:-
https://audiokarma.org/forums/index.php?threads/servicing-a-sansui-9090.957983/#post-14745064
There are numerous restore threads here on AK some of which give listings of the parts used, I am not sure if there is one for the 9090, a search might reveal some threads.
All the information you need, such as capacitor manufacturers and types, and where to get them, advice on how to approach a restore and a great deal of other information is right here on AK, all you have to do is look for it and read.
Thread example:-
https://audiokarma.org/forums/index.php?threads/servicing-a-sansui-9090.957983/#post-14745064
@Hyperion, if I'd like to limit the recap on the following circuit and capacitors, will the UFG or Elna Silmic II be okay for the job?
F-2543 - Tone Control Circuit (2.2uf 25v, 1uf 50v)
F-2544 - Tone Control Circuit (1uf 50v, 10uf 50v, 2.2uf 50v, 10uf 25v)
F-2541 - Equalizer Circuit (3.3uf 25v, 1uf 50v)
F-2545 - Filter & Muting (2.2uf 50v)
F-2436 - Driver Circuit (.47uf 50v, 100uf 80V)
I've searched in mouser and digi-key and the capacitors are available on Nichicon UFG series and Elna Silmic II series except for the 25v. The next available capacitors closest to 25v is rated at 50v.
I'm not sure if it's ok to bump it up.
F-2543 - Tone Control Circuit (2.2uf 25v, 1uf 50v)
F-2544 - Tone Control Circuit (1uf 50v, 10uf 50v, 2.2uf 50v, 10uf 25v)
F-2541 - Equalizer Circuit (3.3uf 25v, 1uf 50v)
F-2545 - Filter & Muting (2.2uf 50v)
F-2436 - Driver Circuit (.47uf 50v, 100uf 80V)
I've searched in mouser and digi-key and the capacitors are available on Nichicon UFG series and Elna Silmic II series except for the 25v. The next available capacitors closest to 25v is rated at 50v.
I'm not sure if it's ok to bump it up.
A lot of those (all below 5µF) could be replaced with film capacitors, a decent film capacitor is better than an electrolytic - even a Silmic II, by a country mile.
This should be a low ESR type like Panasonic FM, FR, Nichicon HE, PW, PM.
