SamWha is South Korean manufacturer, Rubycon is Japaneese. My interest is not to manufacturers, any of them produce capacitors types that are terrible for audio use. But the low-impedance series, that are presumably should have polymeric electrolyte, they frequently happen to be good for sound.
I still have not listen to these SamWha WL, but they measure quite nice.
Another point, Low-ESR caps, that are mass produced for modern electronics, must be less expensive than dedicated audio caps.
Goran, what series of Vishay electrolytics could be suitable for our needs?
I looked at Vishay site, and can not find anything decent for 50-63V and 680-1000uF.
Im using the Vishay BC series LOW ESR caps 220uF/63V, if I remember well there are the caps from the same series 470uF/63V. The cost of the 220uF/63V is about 1 Euro here in Poland. Regards
I ordered the here, but it seems they doesnt have at the moment. There are some other values. Take a look. Allegro.pl - aukcje internetowe, bezpieczne zakupy
Goran, I have found, that Vishay BC is the one among various manufacturers in Vishay Group.
From Vishay BC, it seems that 136 RVI series is close to what we need. Next I put side by side two shots from Vishay and SamWha catalogs. As per datasheets, Vishay BC (39mOhms at +20deg 1000uFx63V) has no one parameter better than SamWha (25mOhms at +20deg 1000uFx63V).
At this site I see Vishay BC 150 RMI series, that for 1000uFx63V shows 42mOhms at 100kHz 20deg.
Yes, it seems from your research the BC series are not the best for Your project. I use them for power supply for SAA7220P, because i cant find oscons in Poland. Maybe the Black Gates would be the better solution but....I can buy them only in my dreams 🙂
Hi,
since you are so fastidious, make sure to choose types with welded internal contacts. Being meant for industrial applications, most electrolytics have low ESR, but that does not say anything about sonic quality. Specifications and measurements don´t give a reliable hint in that regard. There is only one way to know.
since you are so fastidious, make sure to choose types with welded internal contacts. Being meant for industrial applications, most electrolytics have low ESR, but that does not say anything about sonic quality. Specifications and measurements don´t give a reliable hint in that regard. There is only one way to know.
The Sanyo OSCONs seem to give bad bass dynamics, because of the sharp max ripple current fall-down with decreasing frequency. I think Elna Silmic II will be better (if not fake ones). For SamWha WL, this fall-down factor is 0,6 , while for OSCON 0,1-0,2
Since BG will not be produced again, this is one additional reason that it worth looking at various low-ESR industrial application caps.
Last edited:
I agree, but my previous experience with the cluster of 680uF Jamicon WG, was very positive. Therefore I continue along this line.
At the same time, for electrolytics, I am sure in correlation between sound quality and the angle of dielectric losses at 10kHz. If we compare several caps of equal uF, that with smaller dielectric losses will be better (I confirmed it for many variants).
I think it is possible by measuring the angle of dielectric losses at 10kHz. For the 100uF Silmics, that I used at No NFB preamp/headphone amp, I measured the loss angle only 12 degrees at 10kHz, it is very very good value for electrolytics.
Vladimir,
it is in the nature of things that capacitor high frequency performance deteriorates with increasing capacitance value. No investigation is required to prove that.
it is in the nature of things that capacitor high frequency performance deteriorates with increasing capacitance value. No investigation is required to prove that.
So, then, why do we find big 10000uf and higher uF elrctrolytics in 99,99% of power amps? What is your opinion about this fact?
As for me, I am still sure, that not many designers agree with your statement (by the way, I agree with you, and explain some superiority of smaller caps by their relatively better mechanical rigidity and less possibility for electro-mechanical resonances).
Also economy I suppose.
No matter how good a capacitor is, I think 10000uF is too big. I think Goldmund uses multiple of 4700uF or 6800uF caps. That's what I will do.
"The Goldmund Telos 600 monoblock reference amplifier is said to have an ultra-wide bandwidth (DC-3Mhz) and feature extremely low time distortion and "very accurate transient reconstruction."
The Telos 600 achieves its very high power from ten separate high-speed transformers and 40 specially designed ultra-low-impedance capacitors."
It seems that Goldmund's designers make a point in using paralleled parts. Concerning caps the subject is clear, but what goes on with trafos?
The Telos 600 achieves its very high power from ten separate high-speed transformers and 40 specially designed ultra-low-impedance capacitors."
It seems that Goldmund's designers make a point in using paralleled parts. Concerning caps the subject is clear, but what goes on with trafos?
- Status
- Not open for further replies.