Fake Audio Amp IC?

[Meat Plow]

On Tue, 22 Mar 2011 21:59:13 +0000, Gareth Magennis wrote:

"Meat Plow" <mhywatt@yahoo.com> wrote in message
newsan.2011.03.22.21.27.49@lmao.lol.lol...
On Tue, 22 Mar 2011 20:14:50 +0000, Gareth Magennis wrote:

"Gareth Magennis" <sound.service@btconnect.com> wrote in message
news:hiQhp.29782$Xm4.15521@newsfe10.ams2...

Here's a hi res picture of the opened module:


http://postimage.org/image/2qgigsn38/


What are those things?



Gareth.



Why would you mount them in a corner rather than the centre of the
heatsink?

The back of the device is not the heat sink. Don't forget it is to be
torqued down to a much larger heat sink where the location of the power
devices within the package is insignificant.



Oops, I did forget that.


Cheers,


Gareth.

In addition I've seen STK devices similar to these standing alone
without an external sink used to drive large discrete arrays. I think
this was employed in an older Sansui receiver. Formerly doing warranty
service for the Sansui brand I wasn't very fond of any of their equipment
especially higher powered amplifiers.



--
Live Fast Die Young, Leave A Pretty Corpse

 

[Mike Tomlinson]

In article <hiQhp.29782$Xm4.15521@newsfe10.ams2>, Gareth Magennis
<sound.service@btconnect.com> writes

What are those things?

If you mean the square silvery things, they look like power transistors
to me.

Since you have had two fail, how sure are you of other parts in the
output stage or the customer's speakers?

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[Mike Tomlinson]

In article <imaka4$mv5$1@speranza.aioe.org>, bob urz
<sound@inetnebr.com> writes

The epoxied power device slug leads do look a little close together
on a couple of the output devices.

They're both connected to the same solder pad, so no problem.

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(='.'=)
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