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Old 24th May 2003, 07:04 AM   #1
mcp is offline mcp  United States
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Default Beware!!!!! Fake Sankens

This is a much sought after part from Sanken. One is an original, the other a FAKE. The complementary part 2SC2922 looks very close like the original too. Information on how to tell them apart can be found at

http://www.ampslab.com/projects.htm

Regards
Mike
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Old 24th May 2003, 10:57 AM   #2
Piersma is offline Piersma  Netherlands
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Default FAKE

Micheal,

I have taken a look of some 2SA/SC transistors on my shelf and i noticed the following. The lettering "SANKEN" seems original to me but the production run number is in the middle.

I am confused, are they fake or not ?

Greetings from Holland
Piersma
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Old 24th May 2003, 11:17 AM   #3
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Default Re: FAKE

Quote:
Originally posted by Piersma
Micheal,

I have taken a look of some 2SA/SC transistors on my shelf and i noticed the following. The lettering "SANKEN" seems original to me but the production run number is in the middle.

I am confused, are they fake or not ?

Greetings from Holland
Piersma

Hi, Yes I am extremely confused too. Maybe they are both real!
Below a picture from www.schuro.de that I believe is the genuine article. Mike do you have measurements or listening tests to prove which one is real?
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Old 24th May 2003, 11:24 AM   #4
Netlist is offline Netlist  Belgium
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What about those?
They are the original transistors from an old Crest 5000.

/Hugo
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Old 24th May 2003, 12:35 PM   #5
mcp is offline mcp  United States
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Hi everyone,

The one on the right is the real one.

Piersma, Elso....look like your Sankens are OK . If you have the time, check out my site or Rod's. The visual differences are explained more in detail.

Quote:
orginally posted by Elso
you have measurements or listening tests to prove which one is real?
I don't need to. Let's just put it as "supplier & customer confidentiality". If you like to know more, drop me a mail.

Quote:
What about those?
They are the original transistors from an old Crest 5000.

/Hugo
I can only verify 2sc2922 and 2sa1216. The ones in the Crest should be real. One of the main difference between a fake and an original is the inability to supply the same power output. The frightening part is this particular fakes look like real.

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Old 24th May 2003, 02:43 PM   #6
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hi all!

here in my country a shop sells both originals and fakes! fakes for about $0.80 and the orig for $4.50, their reason? some people want to buy cheap ones because the origs are very expensive. But if your amp blows up while using the fakes, the store will not be liable she said.


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Old 30th May 2003, 01:39 PM   #7
mcp is offline mcp  United States
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Default Inside view

I finally cracked open the fake Sanken and compare it to an original. The differences are quite astounding. You can see them at:

http://www.ampslab.com/projects.htm

Regards
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Old 30th May 2003, 02:59 PM   #8
grataku is offline grataku  United States
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Quote:
Originally posted by Netlist
What about those?
They are the original transistors from an old Crest 5000.

/Hugo

Yes, those are the real ones. It's not really hard to tell, come on.
The forgerer had to give it away by using NY as the selection code.
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Old 30th May 2003, 03:04 PM   #9
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Arrow Re: Inside view

Quote:
Originally posted by mcp
I finally cracked open the fake Sanken and compare it to an original. The differences are quite astounding. You can see them at:

http://www.ampslab.com/projects.htm

Regards
Hi Michael,
I am sorry but my gutsfeeling tells me it is the other way around.
I feel the transistor with the die directly attached to the collector case is the real one and the one with the TO-220 case attached to the larger plate is fake.
Maybe others know more about the inwards of transistors.
Please be careful, wash your hands!
You might be exposed to Berylium that is highly toxic.

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Old 30th May 2003, 03:29 PM   #10
grataku is offline grataku  United States
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Elso,
In fact, they are probably both fakes! The selection code is not convincing (i.e. the 1 number and 2 letters) but most of all the weight doesn't match the weight indicated on the datasheet that is ~18 grams.
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