Leach Amp Mod

bvp9223 · 12th August 2005, 11:21 PM

Check this out, guys.
The Leach Amp Mod page is very interesting.
http://www.geocities.com/dblue_research/PowerAmp

bvp9223

jaycee · 13th August 2005, 12:44 AM

I dont see much in the way of mods besides different transistors, compensation on the predrivers, and the removal of the high frequency feedback stage from the drivers. The schematic is slightly misleading as it shows only one pair of outputs when the PCB has 3.

pooge · 13th August 2005, 12:57 AM

I don't understanding the moving of the 390uf input cap outside of the input resistor. This defeats the RC input filter, to what purpose? That cap will load the preamp at high frequencies, for what reason? Don't see the need for the input coupling cap, either.

mastertech · 13th August 2005, 12:59 AM

Hi jaycee, pooge

bvp9223 without doubt both topologies look good,
however topologies dont make amps measurements
do, cause at the end of the day precision wins and
the sound is presice and beautiful, a product of art
rather than science

see you later guys

cheers

bvp9223 · 13th August 2005, 01:10 AM

You're right, Jaycee.
I think that the simulation schematic and PCB schematic are different,; at least as you noticed. I probably try this since it operates at +/-60V.
Let's see.

bvp9223

djk · 13th August 2005, 10:43 AM

That guy doesn't have a clue.

Build the real thing.

12th August 2005, 11:21 PM	#1
bvp9223 diyAudio Member Join Date: Dec 2004 Location: ca	Leach Amp Mod Check this out, guys. The Leach Amp Mod page is very interesting. http://www.geocities.com/dblue_research/PowerAmp bvp9223

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13th August 2005, 12:44 AM	#2
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	I dont see much in the way of mods besides different transistors, compensation on the predrivers, and the removal of the high frequency feedback stage from the drivers. The schematic is slightly misleading as it shows only one pair of outputs when the PCB has 3.

13th August 2005, 12:57 AM	#3
pooge diyAudio Member Join Date: May 2003 Location: Northern Va.	I don't understanding the moving of the 390uf input cap outside of the input resistor. This defeats the RC input filter, to what purpose? That cap will load the preamp at high frequencies, for what reason? Don't see the need for the input coupling cap, either.

13th August 2005, 12:59 AM	#4
mastertech Banned Join Date: Mar 2005 Location: Australia	Hi jaycee, pooge bvp9223 without doubt both topologies look good, however topologies dont make amps measurements do, cause at the end of the day precision wins and the sound is presice and beautiful, a product of art rather than science see you later guys cheers

13th August 2005, 01:10 AM	#5
bvp9223 diyAudio Member Join Date: Dec 2004 Location: ca	You're right, Jaycee. I think that the simulation schematic and PCB schematic are different,; at least as you noticed. I probably try this since it operates at +/-60V. Let's see. bvp9223

13th August 2005, 10:43 AM	#6
djk diyAudio Member Join Date: Feb 2001 Location: USA	That guy doesn't have a clue. Build the real thing.

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