Genuine Rubycon MBZ or not?

[tgab]

Re: Genuine Rubycon MBZ or not?

I've never heard about reforming caps. It seems to be interesting. I'll give it a try.

thanks

[pc7fan]

Re: Genuine Rubycon MBZ or not?

Yeah you should definately try that! Best way to spring old caps back to life

[mariushm]

Re: Genuine Rubycon MBZ or not?

Or you know, you could just buy new capacitors instead of buying 6-7 years old capacitors from dubious sources. There are plenty of electrolytic capacitors that will work in place of those MBZ capacitors.
Alternatively, there's also plenty of polymer capacitors available that can be used and they're not that expensive anymore.

[Behemot]

Re: Genuine Rubycon MBZ or not?

Replacements for MBZ are slowly coming to market, definitelly not plenty of them. I mean, yeah, even general purpose caps will "work in place of those MBZ capacitors" but that's definitelly not "suitable" replacement…

[mariushm]

Re: Genuine Rubycon MBZ or not?

No, I mean you can still buy Nichicon HN or HZ (leftover stock since they got discontinued) which are good enough as replacements for MBZ.. yeah, the specs don't match exactly but it's good enough.
The difference of a few mOhm in esr won't be an issue.

You can also use 2.5v or 4v rated polymers of lower capacitance instead of MBZ without any worries.

[Behemot]

Re: Genuine Rubycon MBZ or not?

Yeah but despite maybe top cats stock all of them are made who knws when as well.

BTW I can get some nice volume of Rubycon MFZ 2700/6,3 in D10.

[tgab]

Re: Genuine Rubycon MBZ or not?

Yeah you should definately try that! Best way to spring old caps back to life

Well I did the reforming some MCZ 1800, but there is no change. The ESR did not get lower (35 mOhm instead of 12), and the capacitance did not get higher (1650uF instead of 1800 uF)

[tgab]

Re: Genuine Rubycon MBZ or not?

Well I guess that egekecu on Ebay are selling the same crap caps like the others.

I paid ~$30USD for 30 caps (12 pcs MCZ 1000uF/10V and 18 pcs MBZ 1800uF).

It is the second time I get rubbish from Egekecu.

Last time (dec 2013) I ordered 12 pcs Nichicon HD. The problem was the same, too high ESR. I was not 21 mOhm but 61 mOhm. I made a complaint. Egekecu apologized and refunded and sent some other suspicious caps, and blocked my ebay username, so I cannot buy from him any more. This time I got my friend to buy them for me.

Well last time I could not give him negative feedback, because he refunded, but I think this is why he has no negativ feedback.
His method is sell craps for high price. If no complain then that's OK, pure benefit.
If someone complains then refund, resend, flatter, etc. so he/she wont give negative, but blacklist him that he will not be able buy, or disturb any more.

Well I will not buy any more caps from ebay from China/HonKong. I will try buying from EU (UK, Germany), but the shipping cost is horrible.

[kc8adu]

Re: Genuine Rubycon MBZ or not?

so you gave the same snake a second chance to bite you?
btw i have some 1500@10 mcz and one day i was bored and checked them.
1610 uf and 11mohm esr.
i have had them a few years and i know that they came from a board mfr as surplus.
so unless those 1800 are fake they would have had to be stored badly to be that far out.or from a bad batch.more likely counterfeit.its not hard to make fake sleeves and resleeve another series to increase their value.
its like batteries.few folks can test them to prove they got fakes.
and i can show hundeds of places to buy fake sleeves for any brand you want.
http://item.taobao.com/item.htm?spm=...d=10193523421&
if i dig a bit i bet i can find cap sleeves too.

Well I guess that egekecu on Ebay are selling the same crap caps like the others.

I paid ~$30USD for 30 caps (12 pcs MCZ 1000uF/10V and 18 pcs MBZ 1800uF).

It is the second time I get rubbish from Egekecu.

Last time (dec 2013) I ordered 12 pcs Nichicon HD. The problem was the same, too high ESR. I was not 21 mOhm but 61 mOhm. I made a complaint. Egekecu apologized and refunded and sent some other suspicious caps, and blocked my ebay username, so I cannot buy from him any more. This time I got my friend to buy them for me.

Well last time I could not give him negative feedback, because he refunded, but I think this is why he has no negativ feedback.
His method is sell craps for high price. If no complain then that's OK, pure benefit.
If someone complains then refund, resend, flatter, etc. so he/she wont give negative, but blacklist him that he will not be able buy, or disturb any more.

Well I will not buy any more caps from ebay from China/HonKong. I will try buying from EU (UK, Germany), but the shipping cost is horrible.

[Jooo]

Re: Genuine Rubycon MBZ or not?

Hi!

I bought some Rubycon caps on Ebay. I guess they're counterfeit because the ESR value does not match the value in the datasheet.

Rubycon MBZ 10V/1000uF 8x16mm, blue colour, K-vent, T0429 date code, measured ESR is 49-52 mOhm (should be 28 mOhm)

Rubycon MCZ 6.3V/1800uF 8x20mm, black colour, K-vent, T0635 date code, measured ESR is 32-35 mOhm (should be 12 mOhm)

What do you think?

Well I guess that egekecu on Ebay are selling the same crap caps like the others.

I paid ~$30USD for 30 caps (12 pcs MCZ 1000uF/10V and 18 pcs MBZ 1800uF).

It is the second time I get rubbish from Egekecu.

Last time (dec 2013) I ordered 12 pcs Nichicon HD. The problem was the same, too high ESR. I was not 21 mOhm but 61 mOhm. I made a complaint. Egekecu apologized and refunded and sent some other suspicious caps, and blocked my ebay username, so I cannot buy from him any more. This time I got my friend to buy them for me.

Well last time I could not give him negative feedback, because he refunded, but I think this is why he has no negativ feedback.
His method is sell craps for high price. If no complain then that's OK, pure benefit.
If someone complains then refund, resend, flatter, etc. so he/she wont give negative, but blacklist him that he will not be able buy, or disturb any more.

Well I will not buy any more caps from ebay from China/HonKong. I will try buying from EU (UK, Germany), but the shipping cost is horrible.

T0429 date code means they were made in 2004. So they may very well be legit, but just very old. Were they supplied in tape like in the ebay picture? Can you post any pictures of the capacitors you received?

[Behemot]

Re: Genuine Rubycon MBZ or not?

All of them are so old, Rubycon stopped making them ages ago. Last one was Nichicon and their ultra-low ESR wet electrolytics are also EOL now.

[tgab]

Re: Genuine Rubycon MBZ or not?

so you gave the same snake a second chance to bite you?

You are right, but I wanted a second chance to make sure that he is not any better than the other chinese cap seller on ebay.
Well before last time when I wanted some caps from ebay I googled the net who to buy from. This is how I got here to this forum. There are a lot of comments here praising egekecu and stating that he sells genuine caps.
I thought that I receved some crap from him by mistake at that time, or something like that.
I wanted to beleive that this time I will receive good caps, but this is not that case, so I'm quite disappointed.
I only want future buyers to be careful buying from him.

[tgab]

Re: Genuine Rubycon MBZ or not?

T0429 date code means they were made in 2004. So they may very well be legit, but just very old. Were they supplied in tape like in the ebay picture? Can you post any pictures of the capacitors you received?

Yes they are on a paper tape. I can make pictures, but I don't think that it is necessary. The pictures on ebay is just the same that i received.

[retiredcaps]

Re: Genuine Rubycon MBZ or not?

The ESR did not get lower (35 mOhm instead of 12), and the capacitance did not get higher (1650uF instead of 1800 uF)

Just curious if you have any good legit caps that meet their datasheet ESR with your meter?

I'm just wondering if your ESR meter is giving accurate readings?

[tgab]

Re: Genuine Rubycon MBZ or not?

I don't know.
My instrument might be inaccurate. I will try to get an another ESR meter to test.
My meter is from here: http://members.upc.hu/lethanh.hung/L...o/en/index.htm

I made some measurement today with 2 instruments. Metrix MX56 can measure capatitance only, and IX3131B can measure capatitance and resistance at 100Hz, 120Hz, 1kHz, 10Khz. Unfortunately it cannot measure resistance at 100kHz.
The result is quite confusing for me:

https://drive.google.com/file/d/0B3u...it?usp=sharing