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Old 5th January 2013, 05:08 PM   #481
LAJ is offline LAJ  United States
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Default I've said it before...

and I'll say it again. Folks, if you find any electronics on the side of the road, by all means grab it.
With quality parts suppliers drying up, this may one day become your only source of good parts!
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Old 9th January 2013, 02:28 AM   #482
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DaveG, great! Thanks for the pix!
These look like the J74BL parts I got scammed on.
Mine have a "W" or "M" in the mold mark - a round spot - on the curved side.

LAJ, I've been saying exactly this for about 3-4 years! Nobody seems to notice.

Unfortunately the great flood of CRT computer monitors and TVs has almost ended now. I grabbed as many as I could, but in reality, that wasn't that many. They had a wide selection of passive and active devices, bipolar and mosfet both.
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http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
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Old 9th January 2013, 03:23 PM   #483
LAJ is offline LAJ  United States
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Default Found a 27" Panasonic TV last week...

on the side of the road. It was only about 5 years old. Had a broken solder connection on the vertical chip.
But I don't see as many CRT computer monitors as I used to. Although in recent years I've found two flatscreen computer monitors.
So I think it depends on where you live.
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Old 10th January 2013, 12:44 AM   #484
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Nah about two years or so ago there were daily lots of CRT monitors at each and every garbage nite here... next to nothing now. It's over. Most have been replaced.

Sure you find some... wonder how many new bits of electronics will show up with bogus parts, and have a failure?

Hope none make it into critical aerospace or medical gear. Geez.

I tell ya, there oughta be a law!

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Old 10th January 2013, 04:48 PM   #485
LAJ is offline LAJ  United States
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Default Did you hear about...

the Chinese made routers showing up in the IT system at the Los Alamos laboratory???
Its really got to bother the Pentagon brass when they look on the rear of their desktop computers and see "Made in China."
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Old 22nd January 2013, 06:49 PM   #486
Onra is offline Onra  Germany
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Looks like there are more people involved than a few hobbyists.
Have a look at this report:
"Inquiry into counterfeit electronic parts in the Department of Defense supply chain"
To find at http://www.gpo.gov/fdsys/pkg/CRPT-11...112srpt167.pdf

Onra
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Old 22nd January 2013, 06:55 PM   #487
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I cannot believe that anyone who receives counterfeit goods from E-Bay doesn't leave NEGATIVE feedback. If you leave no feedback or positive feedback then some other poor bugger is likely to be duped as well.
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Old 24th January 2013, 01:26 PM   #488
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There are parts, in particular actives and opamps, for which one may not be really sure if it's a counterfeit. It takes time and resources to measure and compare against known-good parts, and it still may not be conclusive. By that time, 60 days may have passed or it may have gone off the radar, because the value of the transaction may be too small to waste time on it. That's one of the reasons why there may be no negative feedback for some dodgy transactions on EBay.
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Old 8th February 2013, 02:04 PM   #489
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Default 2SC2922 / 2SA1216 2SC3284 / 2SA1303 not fake

Quote:
Originally Posted by jacco vermeulen View Post
Idss and gm should be enough.
Mr. Jacco Vermeulen...you have a lot of DIY experience.

Sanken 2SC2922 and 2SA1216 LAPT ring-emitter transistors are they still in production, and where can buy genuine parts ?
As you know these two types shown are 200W / 180V / 17A. MT200 house two screws.

Here in the stock I have four sets 2SC3284 / 2SA1303 also LAPT also multi emitters but only:
125W / 150V / 14A TO-3P house one screw.
Are they still in production?

Where do I search for non chinese stuff?

Kim

Last edited by Leakstereo20; 8th February 2013 at 02:06 PM.
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Old 8th February 2013, 02:21 PM   #490
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Default 2SC5200 2SA1943 fakes

Got 10 pairs. ....the 2SC5200 looks like genuine Toshiba's ....all 2SA1943's looks like they have been made upon a kitchen table.....never looked at them, just bought for amplifier repair and then in stock.

....take a look at the close-up 2SA1943 JPG.....thin solderlegs , bad finish and a backside metalpiece formed and made with chisel and hammer compared with the original 2SC5200 Toshiba transistor.

I believed I were on the safe side as far as OP-transistor repair was concerned....but obvious I am not!

Any experience out there?
Attached Images
File Type: jpg PIC_0903.JPG (458.4 KB, 275 views)

Last edited by Leakstereo20; 8th February 2013 at 02:32 PM.
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