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Old 12th August 2005, 11:21 PM   #1
bvp9223 is offline bvp9223  United States
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Default 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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Old 13th August 2005, 12:44 AM   #2
jaycee is offline jaycee  United Kingdom
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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.
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Old 13th August 2005, 12:57 AM   #3
pooge is offline pooge  United States
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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.
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Old 13th August 2005, 12:59 AM   #4
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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
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Old 13th August 2005, 01:10 AM   #5
bvp9223 is offline bvp9223  United States
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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
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Old 13th August 2005, 10:43 AM   #6
djk is offline djk
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That guy doesn't have a clue.

Build the real thing.
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