My Transistors, original or copy? - Page 6

anatech · 16th January 2007, 01:41 AM

Hi Pete,
I've seen some die covered with some kind of clear sealer before in parts I know are real. Factory original dead things.

Yeah, the encapsulent can smell pretty bad. I've opened a few in years gone by.

-Chris

mitwrong · 18th January 2007, 06:35 AM

Quote:

Originally posted by anatech
Hi Pete,

Those transistors look to be very good for a SymAsym.

-Chris

Hi,
Can anybody tell me about what's SymAsym?????

Thanks

anatech · 18th January 2007, 01:38 PM

Hi Mitwrong,
The symasym was a joint project by MikeB and Pavel. They both did a lot of work on this. Here are three threads:
http://www.diyaudio.com/forums/showt...27#post1020427
http://www.diyaudio.com/forums/showt...532#post683532 the original.
http://www.diyaudio.com/forums/showt...23#post1020423
And my search results (many!) are here ....
http://www.diyaudio.com/forums/searc...der=descending

It's a well known amp in this forum.

-Chris

mitwrong · 22nd January 2007, 01:34 AM

Anatech:
Thanks for your info on Symasym. This makes me more unstanding on it.

Thank you very much

anatech · 22nd January 2007, 02:48 AM

Hi Mitwrong,
I am biased.

With the help of Mike and Clem-o, I built a pair of Symasym amplifiers. At about 50 W, they are the right size for many projects. I can tell you that they sound very good. Well beyond the economical amplifier that Mike set out to design. This amp project is a credit to everyone who contributed on this forum.

-Chris

mahirerensan · 28th January 2007, 10:25 AM

I have fifty pieces IR2113 .I am working doing classD amp.These copy.Many mosfets was broken down.I bought the original IR2113.The circuit worked immediately.
I could not believe in.look out!

unclejed613 · 30th January 2007, 04:36 AM

just wondering..... anybody found any fake 2SC5200/2SA1943 transistors?....... just troubleshot two amps today that have shorted output devices, and ordered new transistors. just want to make sure the new ones aren't fake. the originals had laser etched part numbers, and were so hard to read black on black), i had to rub heat sink grease into the lettering to get it to show up. just recently started working at this pro-audio shop, and want to be sure the parts supplier i have been buying from is selling real parts. never had a problem with them before, but with the prices i saw for these parts, i just want to be sure.....

unclejed613 · 1st February 2007, 04:36 AM

as to the use of "goop" on dies..... i have seen the inside of a lot of motorola to-3 transistors, and they always have a drop of clear silicone rubber rubber on the die.

PB2 · 5th February 2007, 03:54 AM

Pictures I took of the Sanken parts:
I got a bit too close with the cut off disk and ground off
the plating and exposed the copper on a few of these:

http://i150.photobucket.com/albums/s...NKEN/CLOSE.jpg

http://i150.photobucket.com/albums/s...ANKEN/OPEN.jpg

http://i150.photobucket.com/albums/s...CLOSE_OPEN.jpg

These parts look good as far as I can tell.

Pete B.

anatech · 5th February 2007, 10:02 PM

Hi Pete,
They look real enough to me!

-Chris

30th January 2007, 04:36 AM	#57
unclejed613 diyAudio Member Join Date: Dec 2006	just wondering..... anybody found any fake 2SC5200/2SA1943 transistors?....... just troubleshot two amps today that have shorted output devices, and ordered new transistors. just want to make sure the new ones aren't fake. the originals had laser etched part numbers, and were so hard to read black on black), i had to rub heat sink grease into the lettering to get it to show up. just recently started working at this pro-audio shop, and want to be sure the parts supplier i have been buying from is selling real parts. never had a problem with them before, but with the prices i saw for these parts, i just want to be sure..... __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: spammers must die

1st February 2007, 04:36 AM	#58
unclejed613 diyAudio Member Join Date: Dec 2006	as to the use of "goop" on dies..... i have seen the inside of a lot of motorola to-3 transistors, and they always have a drop of clear silicone rubber rubber on the die. __________________ Vintage Audio and Pro-Audio repair ampz(removethis)@sohonet.net spammer trap: spammers must die

5th February 2007, 03:54 AM	#59
PB2 diyAudio Member Join Date: Sep 2004 Location: North East	Sanken Pictures Pictures I took of the Sanken parts: I got a bit too close with the cut off disk and ground off the plating and exposed the copper on a few of these: http://i150.photobucket.com/albums/s...NKEN/CLOSE.jpg http://i150.photobucket.com/albums/s...ANKEN/OPEN.jpg http://i150.photobucket.com/albums/s...CLOSE_OPEN.jpg These parts look good as far as I can tell. Pete B.

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16th January 2007, 01:41 AM	#51
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Pete, I've seen some die covered with some kind of clear sealer before in parts I know are real. Factory original dead things. Yeah, the encapsulent can smell pretty bad. I've opened a few in years gone by. -Chris

18th January 2007, 01:38 PM	#53
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Mitwrong, The symasym was a joint project by MikeB and Pavel. They both did a lot of work on this. Here are three threads: http://www.diyaudio.com/forums/showt...27#post1020427 http://www.diyaudio.com/forums/showt...532#post683532 the original. http://www.diyaudio.com/forums/showt...23#post1020423 And my search results (many!) are here .... http://www.diyaudio.com/forums/searc...der=descending It's a well known amp in this forum. -Chris

22nd January 2007, 01:34 AM	#54
mitwrong diyAudio Member Join Date: Oct 2006	Anatech: Thanks for your info on Symasym. This makes me more unstanding on it. Thank you very much

22nd January 2007, 02:48 AM	#55
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Mitwrong, I am biased. With the help of Mike and Clem-o, I built a pair of Symasym amplifiers. At about 50 W, they are the right size for many projects. I can tell you that they sound very good. Well beyond the economical amplifier that Mike set out to design. This amp project is a credit to everyone who contributed on this forum. -Chris

5th February 2007, 10:02 PM	#60
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Pete, They look real enough to me! -Chris

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