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Inclusive Compensation and Ultra-Low Distortion Power Amplfiers

Author(s): Self Douglas

Two things define the distortion performance of a power amplifier; the open-loop linearity of the circuitry, and the amount of negative feedback that can be safely...

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The Arch Nemesis

Author(s): Pass Nelson

This article is available on-line for free! Nelson Pass' designs invariably give excellent sound quality from a simple, class-A based design. The large idle...

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Square-Law class-A: a family of efficient class-A power amplifiers

Author(s): Hegglun Ian

It is well known that Class-A gives the best sound quality in audio power amplifiers but the efficiency is so low that it is impractical to build much more than...

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A New Amplifier Topology With Push-Pull Transimpedance Stage

Author(s): Groner Samuel

In this article Samuel reviews existing transimpedance stage configurations, and then introduces an amplifier topology which uses a novel push-pull transimpedance...

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SIT Nemesis!

Author(s): Pass Nelson

In Linear Audio Vol 0, Nelson Pass paid tribute to the classical single-ended transformer-coupled triode amplifier with the Arch Nemesis. Inspired by Jean Hiraga'...

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The Class i output stage

In this article, Kendall presents a solid state unity-gain power output stage that has very low distortion and for which the biasing current can be set without the...

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Design Considerations for a Class-A Amplifier Enclosure

Author(s): EUVL

Many class-A amplifiers are placed in a largish enclosure with heatsinks that ‘look about right’. But, just as with the electronics involved, you can...

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The “Terrible Twins” – a push-pull amplifier with solid state pentodes

Author(s): Hesener Alfred

Inspired by Nelson Pass' work with Static Induction Transistors, and Lennart Jarlevang's  experience with the PASS-SIT-1 in a single-ended configuration...

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Revisiting the SIT Nemesis

Author(s): Jarlevang Lennart

Lennart Jarlevang gets his hands on the best of two world: a pair of massive single-ended transformers from a vintage Hiraga-designed Nemesis amplifier and a pair of...

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Static Induction Transistors

Author(s): Pass Nelson

Static Induction Transistors are remarkably like triodes, both in electrical characteristics and sound character. There was a brief period when Sony and Yamaha...

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