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20th January 2008, 09:55 PM
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#1 |
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diyAudio Member
Join Date: Jan 2006
Location: Serbia - Niska Banja
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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? Recommendations? |
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21st January 2008, 05:26 AM
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#2 |
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diyAudio Member
Join Date: Apr 2003
Location: Copenhagen, Denmark
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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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Free Schematic and Service Manual downloads www.audio-circuit.dk, Company: www.dupont-audio.com, Joint venture: www.DupontMantra.com |
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21st January 2008, 11:16 AM
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#3 |
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diyAudio Member
Join Date: Feb 2001
Location: USA
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The supply board from the A75 is still available from:
www.audioxpress.com I would use a smaller transformer for the boosted voltage, rather than a doubler. http://www.passdiy.com/pdf/a75p2.pdf
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