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-   -   Leach Amp Mod (http://www.diyaudio.com/forums/solid-state/62453-leach-amp-mod.html)

bvp9223 13th August 2005 12:21 AM

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


bvp9223

jaycee 13th August 2005 01:44 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 01:57 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 01:59 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 02:10 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 11:43 AM

That guy doesn't have a clue.

Build the real thing.


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