I've heard of counterfeits and knock off's, but this takes the cake in my book. I ordered 6) MJ15024's & 6) MJ15025's out of Vancouver. Two of each pr went into a Marantz receiver I had on the bench. One channel WAS working before I got started. I replaced both channel's outputs as a matter of course. On pwr up test, (variac) BOTH channels had a dead short! To my dismay, I discovered BOTH MJ15024's where dead shorted, they measured like there was no junction (die) in the casing. Hmm. I checked the other 4 and found 2 more dead ones, so out of 6, 4 where dead! I let my parts guy know and he sent me 4 more with many sorries. I tested them and 2 out of the 4 where dead!
I couldn't help it,, I cut the tops off the orig and the MJ. Have a look and tell me which one you'd rather have in your amp!
I'll post the pic's as soon as I figure out how to.
Cheers, Al
I couldn't help it,, I cut the tops off the orig and the MJ. Have a look and tell me which one you'd rather have in your amp!
I'll post the pic's as soon as I figure out how to.
Cheers, Al
Go to post reply, advanced mode, manage attachments, and post your pix.
Sorry to hear about the bad parts, counterfeit semiconductors and electrolytic caps have become a really big problem.
Sorry to hear about the bad parts, counterfeit semiconductors and electrolytic caps have become a really big problem.
I only buy transistors from places like Mouser or Allied for that reason. I read about people buying parts on ebay and I just shudder.
ebay is not the best place unless you know who your buying from,Like Cliff jack USA is made in China,and when I asked they about Cliff UK they said they where not around anymore and that Cliff USA was better..... NOT!!!
Check this :
Counterfeit Transistors
and this one has even more, only it's in Spanish :
Transistores falsificados
Counterfeit Transistors
and this one has even more, only it's in Spanish :
Transistores falsificados
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