### Counterfeit transistors

small_boy · 2008-01-15 2:28 pm

Actually Sanken is distributed by Allegro http://www.allegromicro.com/en/

But who distribute the sanken to germany where privat customer can buy this. The two in the list of allegro that distribute to germany only for Companys and has no sanken transis in his product list.

Dirk

TOINO · 2008-01-15 4:57 pm

Hi small_boy

In Germany don’t know.
But I strongly recommend you http://www.profusionplc.com/pro/gex/manuftable1?imanuf=sanken in UK.

small_boy · 2008-01-16 11:11 pm

OK, have mail from ISCSemi !

The 2SC2922 with scratch are realy from ISCSemi. OK, less one problem.

The service of ISCSemi is very good and fast. I was real astonished.

Miss Lynn from ISC has send me per mail the Datasheets for the 1216 and 2922. because probs with Homepage of ISC.

When i look in the datasheet i mean that the data are same as the data from Sanken´s 2S. Or not ?

Datasheet of 2922 :

An externally hosted image should be here but it was not working when we last tested it.

and for 1216 as pdf attached.

Big different between Sanken and ISC ?

Dirk

Eva · 2008-01-17 1:24 am

AndrewT · 2008-01-17 3:05 pm

Hi,
the Sanken graphs have been relabeled but otherwise the data seems to be identical.

Tarzan · 2008-01-31 8:53 pm

Have a look at this tread:
http://www.diyaudio.com/forums/showthread.php?postid=1415991#post1415991
Tarzan

Tarzan · 2008-02-06 8:35 am

Hello Small Boy (again) and all others,

Got the AN scanned and convert each page (8) in to a pdf file.
Sorry to tell you they are HUGE in size.
An RAR file with all 8 of them is 22MB.
Each file in turn about 4.5 MB.
Contact me direct so that I can send them to you.
It needs however a seperate 300V psu.
This instrument could be a very interesting project.
It will surely have it's use with all the counterfeit power transistors around that can blow up your expensive repair or project.

Cheers,
Tarzan

Tarzan · 2008-02-06 9:01 am

poynton · 2008-02-06 4:13 pm

Tarzan said:
This instrument could be a very interesting project.
It will surely have it's use with all the counterfeit power transistors around ............

Could I suggest you start a new thread for the construction of the tester.

I, for one, would be interested.

Andy

small_boy · 2008-02-07 12:01 pm

Thx Tarzan !

Could I suggest you start a new thread for the construction of the tester.

i find , thats a good idea

Tarzan · 2008-02-07 2:25 pm

Yep, I think it is.
I had a quick look on ebay to find out if most of the components mentioned in the 30+ year old document are available.
Well the mercury wetted relay is available, as is the pulse generator.
The other components like the semicons can be sustituted by others.
Some parts as the psu can be simplified by a LM317 etc...

But I start a new tread this evening.

Let's declare war to the counterfeit transistors...

Tarzan

small_boy · 2008-02-07 3:32 pm

rebuild the good old testset with new and modern components. I think thats a realy good idea.

Tarzan · 2008-02-07 6:46 pm

Hi all,

Here is the new tread:

http://www.diyaudio.com/forums/showthread.php?postid=1422436#post1422436

Thanks for the support.

Tarzan

viktor1986 · 2008-08-06 12:17 pm

!

Does anybody know who is manufacture of this transistors?I think that 2N5551 is manufactured by ON but who made second one?

An externally hosted image should be here but it was not working when we last tested it.

weissi · 2008-08-06 9:39 pm

I know continental semicon (india)

viktor1986 · 2008-08-06 9:42 pm

!

Thank's for information.

Are you 100% sure?

AndrewT · 2010-07-23 2:16 pm

post48 gives links to info.
Access denied.
Is there a way to see the pages?

Tarzan · 2010-07-28 5:43 pm

Hi Andrew T,
I will post these pages on the web again.
I removed myself from the tread and also missed all the comments.
Give a few days and the files will be available again.

Cheers,
Tarzan

metal · 2010-07-28 11:15 pm

Here is my super fake on the right, genuine on the left. The die of the genuine is closer to 6mm x 6mm. I spent much time smashing the genuine. For the fake, or super fake, it was a matter of an extremely weak pliers force:

An externally hosted image should be here but it was not working when we last tested it.

Notice how this super fake has numbers on it in the lower small circles, notice how the mold was easily removed. I also noticed that the mold in the genuine is so much stronger and is of much higher density, contrary to the fake ones:

An externally hosted image should be here but it was not working when we last tested it.

And those were the so much fake, their sound sucks, and no numbers in the small lower circles:

An externally hosted image should be here but it was not working when we last tested it.

These are excellent photos, rarely found on the net, I don't recall I came across very close and clean photos of genuine and fake. I can also provide excellent photos for genuine 2SA1943 and 2SC3281. If any one is interested let me know.

homemodder · 2010-07-29 12:21 am

Metal thanks for the pics, I think it would be in a lot of members interest if you did post the other pics too, it helps not to fall in the pit with regards to fakes.

### Counterfeit transistors

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