$7500.00 chipamp revealed

sendler · 21st February 2009, 01:53 PM

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?
.
http://www.shine7.com/audio/jeff.htm
.
Check out the nice review.
.
http://www.audioasylum.com/forums/am...ages/7578.html
.
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, 02:13 PM

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

soongsc · 21st February 2009, 02:34 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, 03:25 PM

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, 03:38 PM

Quote:

Originally posted by jaudio

What output transistors are you using with the TDA7250?

.
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, 03:44 PM

Quote:

Originally posted by sendler
My TDA7250 amps are running with cheap TIPs. .

Have you tried National's audio drivers?

sendler · 21st February 2009, 03:48 PM

Quote:

Originally posted by jaudio

Have you tried National's audio drivers?

.
No. Which ones are you looking at?

bigwill · 21st February 2009, 04:05 PM

It looks like a PC

Hurtig · 21st February 2009, 04:24 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....

jaudio · 21st February 2009, 05:41 PM

Quote:

Originally posted by sendler

.
No. Which ones are you looking at?

LME49810 or LM4702

21st February 2009, 01:53 PM	#1
sendler diyAudio Member Join Date: Aug 2004 Location: ny	$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? . http://www.shine7.com/audio/jeff.htm . Check out the nice review. . http://www.audioasylum.com/forums/am...ages/7578.html . 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. __________________ Scott

21st February 2009, 02:34 PM	#3
soongsc diyAudio Member Join Date: Mar 2005 Location: Taiwan	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. __________________ Hear the real thing!

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21st February 2009, 02:13 PM	#2
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. some days ago i have bougt a lm3886........... i am amused. greetings........

21st February 2009, 04:05 PM	#8
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	It looks like a PC

21st February 2009, 04:24 PM	#9
Hurtig diyAudio Member Join Date: Feb 2005 Location: Denmark - Århus	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....

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