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-   -   $7500.00 chipamp revealed (http://www.diyaudio.com/forums/chip-amps/139033-7500-00-chipamp-revealed.html)

sendler 21st February 2009 02:53 PM

$7500.00 chipamp revealed
 
Most of you have probably already seen this but this is my first time through the BPA300 threads so I thought I would throw this out again for some others that may have missed it.
Ever seen the inside of a $7500.00 chip amp?
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http://www.shine7.com/audio/jeff.htm
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Check out the nice review.
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http://www.audioasylum.com/forums/am...ages/7578.html
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Maybe I need to try these chips again and use a few more of them this time. I didn't pay attention at the time, what with all of the fervor surrounding them, but a gainclone with 1 LM3886 per channel is only making 38 watts into 8 ohms which may go a long way towards explaining why my TDA7250 amps sounded so much better.

mjf 21st February 2009 03:13 PM

hello.
some days ago i have bougt a lm3886...........
i am amused.
greetings........

soongsc 21st February 2009 03:34 PM

With the right power supply and PCB layout, the LM3886 really are quite good. They do, however, need to have constant speaker loading for optimum performance due to the way feedback is used. I also recall a different topology somewhere in this forum.

jaudio 21st February 2009 04:25 PM

Re: $7500.00 chipamp revealed
 
Quote:

Originally posted by sendler
but a gainclone with 1 LM3886 per channel is only making 38 watts into 8 ohms which may go a long way towards explaining why my TDA7250 amps sounded so much better.

What output transistors are you using with the TDA7250?

sendler 21st February 2009 04:38 PM

TDA7250 output is running with cheap TIPs
 
Quote:

Originally posted by jaudio



What output transistors are you using with the TDA7250?

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My TDA7250 amps are running with cheap TIPs. The Phillips were a little more open sounding than the STMicro. I know this will hurt many others here but that amps kills a single 3886 with the same power supply. I have the parts for a Sziklai but haven't tried it yet.

jaudio 21st February 2009 04:44 PM

Re: TDA7250 output is running with cheap TIPs
 
Quote:

Originally posted by sendler
My TDA7250 amps are running with cheap TIPs. .
Have you tried National's audio drivers?

sendler 21st February 2009 04:48 PM

Re: Re: TDA7250 output is running with cheap TIPs
 
Quote:

Originally posted by jaudio


Have you tried National's audio drivers?

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No. Which ones are you looking at?

bigwill 21st February 2009 05:05 PM

It looks like a PC :D

Hurtig 21st February 2009 05:24 PM

First they go for cheap ICE Power moduls and now $7500 for a box containing cheap power-op-amps! They should be ashamed!

I guess there is no limit of what the so called "High End Industry" will do to make some money!
I also just discovered, that Mark Levinson has launched a class-D amp. Probably worse than a ICE Power based amp, but at that price, people will no have the guts to dislike it.... :D

jaudio 21st February 2009 06:41 PM

Re: Re: Re: TDA7250 output is running with cheap TIPs
 
Quote:

Originally posted by sendler

.
No. Which ones are you looking at?


LME49810 or LM4702


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