Fake MJ15024 BEWARE!

[leam123]

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

 

[kevinkr]

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.

 

[Enzo]

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.

 

[leam123]

Here are my Pic's

 

[tempted]

Leam123,

thanks for the head's up,

I've fixed this for better viewing..

 

[bob barcus]

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!!!

 

[djmiddelkoop]

Check this :

Counterfeit Transistors

and this one has even more, only it's in Spanish :

Transistores falsificados

 

[briansune]

Could any one tell me that is this real or fake plz.

 

[franzm]

They're from RS Components and are marked according to the datasheet.