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Old 20th January 2008, 09:55 PM   #1
velicko is offline velicko  Serbia
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Default Leach amp - regulated supply only for the voltage gain stages?

Somebody, if I can remember djk mentioned that adding regulated power supply for the voltage gain stages of Leach amp would make improvement in sound.

Further investigation showed that McIntosh and Electrocompaniet are doing something like that...

Has anyone done that on Leach amp?

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Old 21st January 2008, 05:26 AM   #2
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A quite common techniqe.

Make a regulated supply with the same Voltage as for the output stage, or make the voltages 3-5V higher to compensate for the Vbe drop in the output stage.
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Old 21st January 2008, 11:16 AM   #3
djk is offline djk
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The supply board from the A75 is still available from:


I would use a smaller transformer for the boosted voltage, rather than a doubler.

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