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My Transistors, original or copy?
My Transistors, original or copy?
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Old 3rd March 2019, 10:14 AM   #1041
kees52 is offline kees52  Netherlands
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Quote:
Originally Posted by grunf View Post
I have some suspicious transistors, the first should be Hitachi and the other Sanyo. hfe is for both ok. What do you think, are they original?
These looks original.



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Old 5th March 2019, 03:26 AM   #1042
anatech is offline anatech  Canada
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My Transistors, original or copy?
Hi grunf,
The two "667" are fake for sure. The lettering was not sharp and clear like those, and the "667" would have been labeled "D667". Same for the "C3117", the lettering is far too neatly done. They used stamps back then, not a laser.

I have noticed that most fakes have beta in the area of 200. There must be a standard die everyone is using or something along those lines.

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Old 26th March 2019, 10:07 AM   #1043
rediceman is offline rediceman
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Quote:
Originally Posted by peranders View Post
Nickel is also magnetic.
Firstly
I am sorry for my English

Thank you for the information
original dismantled parts are not magnetizing.Probably made of copper.
Nickel still creates doubt

I'm going to share the enlarged pictures of the piece so that the doubts go away.
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Old 20th April 2019, 04:33 PM   #1044
audiohed is offline audiohed  Canada
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I know this is an old thread, but I have to ask, perhaps rhetorically...if Chinese manufacturers are geared up to produce transistors, why not make them as well as the originals?? As it is, all their products are now suspect, and have given themselves a bad name. I would gladly pay a premium price for quality, Toshiba -like units, rather than take a chance on substandard crap. It doesn't make sense! Having said that, I think I do have some repro Jfets in a preamp I built, and it sounds great IMHO. We'll see long term.
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Old 20th April 2019, 07:40 PM   #1045
voltwide is offline voltwide  Ireland
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money is earned with cheap crap, not with high quality parts.
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Old 20th April 2019, 08:36 PM   #1046
asuslover is offline asuslover  Romania
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My Transistors, original or copy?
They do have their own transistors with very good specs for sure but they can’t use the same name or not even part of name/number as the original ones.
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Old 20th April 2019, 10:51 PM   #1047
wg_ski is offline wg_ski  United States
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Originally Posted by voltwide View Post
money is earned with cheap crap, not with high quality parts.
Money is earned with high quality parts. The shareholders get a fat return for as little as possible with cheap crap.
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Old 21st April 2019, 10:55 AM   #1048
kees52 is offline kees52  Netherlands
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I do see and hear here about a lot of fakes, but are there also chinese deliverers who do send good ones, and as wsuch why not put them here, good for them and for us.
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Old 3rd May 2019, 04:09 PM   #1049
kees52 is offline kees52  Netherlands
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I have strange outcomes the TL072 chips are not original or reprints, I get voltage from the input and the output clips the wrong way compare with simulation.

I think the opamps are bjt versions, I have jfet need, also the opa3234 are nog original because building and sim does not match at all.

I do not now why these chinese does rip people, is this the country we get mobile G5 from? very unwise.
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Old 4th May 2019, 04:09 AM   #1050
davada is offline davada  Canada
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Originally Posted by kees52 View Post
is this the country we get mobile G5 from? very unwise.

Yes. But they make really good network gear.
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