Valve Amplifiers, Fourth Edition May 2026

– Focuses on input selection, volume/tone controls, and detailed RIAA stage design for vinyl playback. Key Updates in the Fourth Edition

: Updates on semiconductor constant current sources (CCS), including equations and measurements for devices like the DN2540N5. Valve Amplifiers, Fourth Edition

(2012) by Morgan Jones is a comprehensive reference for the design, construction, and maintenance of high-fidelity vacuum tube audio equipment. This edition expands on previous versions by shifting focus from distortion reduction to background noise reduction and introducing modern components like semiconductor constant current sources. Core Content Overview – Focuses on input selection, volume/tone controls, and

: Explores "statistical regulators" using stacks of Zeners to achieve lower noise compared to single high-voltage Zeners. This edition expands on previous versions by shifting

– Details rectification, smoothing, and high-performance regulators.

: Introduces new power amplifier designs and a hybrid balanced RIAA stage.