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Thorsten at a mixing desk

A hi-fi show room with small loudspeakers

Thorsten showing a product at a trade show

Single-ended valve amplifier theory: Image47.gif — Single-ended valve amplifier theory

Modern recording (cartoon)

Articles

Articles

Theory, design write-ups and how-tos.

Article

This Is How to Turn an Edison 60 Kit into a 300B Amplifier

Converting the Edison 60 amplifier to 300B output valves, by Thorsten Loesch.

12 Oct 2026 Edison 60 - 300B 300B Edison 60 Kit

Article

This Is How to Put Valve Stages Behind a DAC, Explained

The 1999 article for the London Live DIY Hifi Circle, with the 2010 comments and new 2026 notes on ultrasonic DAC output and op-amp stages.

7 Oct 2026 DAC DAC With Tubes

Article

This Is Single-Ended Valve Amplifier Theory, Explained

An introduction by Thorsten Loesch, from his Thunderstone Audio site.

6 Oct 2026 300B Tube Amp Theory