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Old 16th January 2007, 12:41 AM   #51
anatech is offline anatech  Canada
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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
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Old 18th January 2007, 05:35 AM   #52
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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
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Old 18th January 2007, 12:38 PM   #53
anatech is offline anatech  Canada
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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
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Old 22nd January 2007, 12:34 AM   #54
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Anatech:
Thanks for your info on Symasym. This makes me more unstanding on it.

Thank you very much
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Old 22nd January 2007, 01:48 AM   #55
anatech is offline anatech  Canada
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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
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Old 28th January 2007, 09:25 AM   #56
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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!
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Old 30th January 2007, 03:36 AM   #57
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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.....
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Old 1st February 2007, 03:36 AM   #58
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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.
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Old 5th February 2007, 02:54 AM   #59
PB2 is offline PB2  United States
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Default 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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Old 5th February 2007, 09:02 PM   #60
anatech is offline anatech  Canada
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Hi Pete,
They look real enough to me!

-Chris
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