Class-A Power Amp

Posted on Nov 20, 2012

The capacitors needed for the power supply are massive to try to get rid of hum, and massive means expensive. The `improved` Zen is a little better, since it uses an inductor (or choke) in the supply - obviously the hum drove someone mad. Inductors are expensive too, and also hard to get, and the capacitance has been doubled in at least one version I have seen - ouch, this is seriously expensive!

Class-A Power Amp
Click here to download the full size of the above Circuit.

Well, actually I can see why it is popular. It satisfies the requirement of many amplifier builders, in that it is simple, stable, and very tolerant of layout and component variations. The sonic characteristics will also appeal to many, due to the valve-l

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