Lesson learned-I got what I paid for- cheap mosfet & caps

birdyman · 13th February 2010, 05:23 PM

I bought J162 and K1058 pairs from Hong Kong seller on ebay.($17 for 4) They blew up on 30v rail. They supposed by Renesas product, but it dose not bear any marking of such. I was replacing shorted Hitachi parts. The channel is working with transplanted Hitachi pair from other channel. I also bought 15000uf 100v filter caps on ebay from FL seller, it passes too much ripple on 80v rail resulting too much ripple humm. This cap supposed to be new and price $16/pc. I am using my salvaged 10000uf caps for now with better ripple noise control.

I guess I learned lesson on the hard way. But it was too good a price to pass on them.

okkyn · 9th April 2010, 04:19 PM

Hi birdyman, sorry to hear that.

I was thinking buying some Renesas' from eBay, but not sure now. Could you tell us which eBay seller?

kevinkr · 9th April 2010, 04:23 PM

It's a pretty risky proposition buying electrolytic caps and many semiconductors on eBay. I think it is preferable if admittedly more expensive to go to an authorized reseller.

There are a lot of counterfeit parts on eBay.

qusp · 19th April 2010, 01:06 PM

yes, heaps of fakes, but also some good paerts from good sellers, which makes it very difficult. but after enough bad experiences with 'NOS' parts I decided to give it a miss altogether despite the likelihood of missing out on some good deals

13th February 2010, 05:23 PM	#1
birdyman diyAudio Member Join Date: Jan 2010	Lesson learned-I got what I paid for- cheap mosfet & caps I bought J162 and K1058 pairs from Hong Kong seller on ebay.($17 for 4) They blew up on 30v rail. They supposed by Renesas product, but it dose not bear any marking of such. I was replacing shorted Hitachi parts. The channel is working with transplanted Hitachi pair from other channel. I also bought 15000uf 100v filter caps on ebay from FL seller, it passes too much ripple on 80v rail resulting too much ripple humm. This cap supposed to be new and price $16/pc. I am using my salvaged 10000uf caps for now with better ripple noise control. I guess I learned lesson on the hard way. But it was too good a price to pass on them.

9th April 2010, 04:23 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	It's a pretty risky proposition buying electrolytic caps and many semiconductors on eBay. I think it is preferable if admittedly more expensive to go to an authorized reseller. There are a lot of counterfeit parts on eBay. __________________ www.kta-hifi.net

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9th April 2010, 04:19 PM	#2
okkyn diyAudio Member Join Date: Aug 2005 Location: Bukit Panjang	Hi birdyman, sorry to hear that. I was thinking buying some Renesas' from eBay, but not sure now. Could you tell us which eBay seller?

19th April 2010, 01:06 PM	#4
qusp Sometimes a square peg fits a round hole just fine diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	yes, heaps of fakes, but also some good paerts from good sellers, which makes it very difficult. but after enough bad experiences with 'NOS' parts I decided to give it a miss altogether despite the likelihood of missing out on some good deals

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