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Old 7th Apr 2012, 2:55 am   #32
Radio Wrangler
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Join Date: Mar 2012
Location: Fife, Scotland, UK.
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Default Re: JLH Class 'A' Amplifier

As Silicon said, interesting choice of a switcher for the power supply.

Linn went to switchers in the late 1980s mostly because of needing power factor correction, I believe.

For most class A/B hifi amps, the pulsing current demand requires unusually good bandwidth in the switcher's control loop and you can get into all sorts of trouble. The class A design doesn't stir up this problem.

A past boss of mine got into a protracted argument with JLH over the advantages in noise floor of series and shunt modes of negative feedback, in the letters pages of Wireless World.

I like the ziggurat heatsinks!

David
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