My Transistors, original or copy? - Page 47 - diyAudio
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Old 27th February 2012, 11:15 AM   #461
zsaudio is offline zsaudio  Europe
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Could anyone tell me if these trannies are fake or not?

2SA1407E_first2.jpg
I bought this 2sa1407 several years ago from a reputable Sanyo dealer.

2SA1407E_second2.jpg

Then i bought this one right now from the same shop

2SC3601E_2.jpg
2SC3601

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zsaudio
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Old 27th February 2012, 11:22 AM   #462
zsaudio is offline zsaudio  Europe
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Some others

2SA1207S_2.jpg

2SA1208S_2.jpg

2SC2909S_2.jpg

2SC2910S_2.jpg

zsaudio
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Old 28th February 2012, 11:43 AM   #463
zsaudio is offline zsaudio  Europe
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Any idea?
Anyone has experience with these trannies?
Help me please!
Thanks
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Old 2nd April 2012, 10:34 PM   #464
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try some of these..
- case comparison with genuine parts
- open case to see its chip and its dimension (destructive)
- measurement of electrical parameters (max)
(for bjt : hfe, Vcemax, Icmax, Pmax, ...Ft)
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Old 27th July 2012, 08:08 PM   #465
Ryssen is offline Ryssen  Sweden
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Quote:
Originally Posted by KatieandDad View Post
This one measures as a genuine 2SK170BL and it doesn't have cowboy legs.
If it has cowboy legs does it mean it is a fake one?
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Old 28th July 2012, 05:06 PM   #466
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the "cowboy legs" means it was packaged on tape for a pick-and-place machine.
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Old 6th August 2012, 11:57 AM   #467
pshdk is offline pshdk  Denmark
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There is a company in the UK that offer parts and hard to find parts. They have a one year guarantee,parts are tested before sending. ISO Approved, and they deal with some big company's too,eg. Bosch, Intel ect. But they have a minimum order of 130 Euro. So no worries when buying from them. Can I post the name of the company here or is that against forum rules?
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Old 6th August 2012, 01:22 PM   #468
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Quote:
Originally Posted by pshdk View Post
There is a company in the UK that offer parts and hard to find parts. They have a one year guarantee,parts are tested before sending. ISO Approved, and they deal with some big company's too,eg. Bosch, Intel ect. But they have a minimum order of 130 Euro. So no worries when buying from them. Can I post the name of the company here or is that against forum rules?
I think, you can post this name.
mean you this company?
Mil/Aerospace Division - Bipolar NPN
Magnatec. ALFET Lateral MOSFETs
or this:
Sanken Power Systems (UK) Ltd
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Old 7th October 2012, 10:19 PM   #469
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Here I am with 2sj109bl

Have orderd them at little diode in england some times ago.
Now they have crazy prices for that part.

Thougt they where genuine.
Idss measured well beween 6,6mA at the lowest an 8,9mA at the highest.

But had 2 of the 4 at the frontend of an Aleph J and threre was hum.
Replaced them by a matched pair 2sj74 hum was gone.

Now i am not so sure anymore that they are genuine.

what do you think?
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Old 8th October 2012, 05:48 AM   #470
Salas is online now Salas  Greece
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They got the right looks and IDSS though. Don't know if hum in a certain build can tell directly, I guess you should try them in some other circuits too. John Curl style line stage test maybe.
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