Toshiba trannies from ebay

Iain McNeill · 27th May 2009, 02:33 AM

I just bought some Toshiba transistors on Ebay:

Now I know that they're not Bruel & Kjaer because then they would be that expensive green colour.

The dot on the bottom says "guangong"

Anyone heard of B&K transistors?
Should I just throw them in the garbage?

poynton · 27th May 2009, 04:52 AM

http://www.commerce.com.tw/modules.p...de&ID=E0125225

maybe ..........

Wavebourn · 27th May 2009, 05:09 AM

Throw them in a curvetracer. John Curl has one.

wg_ski · 27th May 2009, 05:17 AM

Quote:

Originally posted by Iain McNeill

Should I just throw them in the garbage?

Crack one open - compare the guts to known good and known fake. Or if you're brave, whip up a test board with one pair and +/-65V rails. And run an easy 8 ohm load and see what happens. Then give us a report.

Iain McNeill · 27th May 2009, 06:01 AM

Thanks Poynton,
that kinda confirms my fears.
W & W: you are right. Let's apply some power and load.

I have a genuine Toshiba SA1302 that I can compare BK to. Vce and Ic limits are easy but what about measuring Cob as a way of verifying die size?

Could a PSRR test rig measure Cob at bias?

awpagan · 27th May 2009, 06:27 AM

"I just bought some Toshiba transistors on Ebay"

They are new 2SA1302/2SC1382's you just bought recently and you expect them to be originals?

Iain McNeill · 27th May 2009, 06:49 AM

no, I knew it was too good to be true but I guess I like to gamble

sakis · 27th May 2009, 07:55 AM

Quote:

Originally posted by Iain McNeill
Thanks Poynton,
that kinda confirms my fears.
W & W: you are right. Let's apply some power and load.

I have a genuine Toshiba SA1302 that I can compare BK to. Vce and Ic limits are easy but what about measuring Cob as a way of verifying die size?

Could a PSRR test rig measure Cob at bias?

though is not the original toshibas .... its something else
i still have 120 pairs of original bought arround the 90's

there is a picture

poynton · 27th May 2009, 09:44 AM

What I find interesting is they make no attempt to pass them off as "Toshiba" (except perhaps in the Ebay listing) or to disguise where they are from.

So maybe they are equivalents?

Andy

awpagan · 27th May 2009, 10:26 AM

Quote:

Originally posted by poynton
What I find interesting is they make no attempt to pass them off as "Toshiba" (except perhaps in the Ebay listing) or to disguise where they are from.

So maybe they are equivalents?

Andy

Or by the device number?

Maybe by now, with the amount of counterfeits, the device numbers of
2SA1302 and 2SC3281's are classified as generic devices,,,,,

27th May 2009, 04:52 AM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	http://www.commerce.com.tw/modules.p...de&ID=E0125225 maybe .......... __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

27th May 2009, 05:09 AM	#3
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Throw them in a curvetracer. John Curl has one. __________________ The devil is not so terrible as his mathematical model! Wavebourn: We Create Creativity!

27th May 2009, 06:27 AM	#6
awpagan diyAudio Member Join Date: Nov 2004 Location: sydney	"I just bought some Toshiba transistors on Ebay" They are new 2SA1302/2SC1382's you just bought recently and you expect them to be originals? __________________ Indecision makes the world gone round. Maybe

27th May 2009, 09:44 AM	#9
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	What I find interesting is they make no attempt to pass them off as "Toshiba" (except perhaps in the Ebay listing) or to disguise where they are from. So maybe they are equivalents? Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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27th May 2009, 06:49 AM	#7
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	no, I knew it was too good to be true but I guess I like to gamble

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