jlh ckass a

 

The JLH Class A amplifier, designed by John Linsley Hood in 1969, stands as a classic and enduring example of a simple, high-fidelity audio circuit. It operates in pure Class A, meaning its output transistors are constantly conducting a significant amount of current, even when there's no input signal. This constant current draw eliminates the crossover distortion that can occur in Class B or AB amplifiers, resulting in a smooth, warm, and highly linear sound that many audiophiles find exceptionally pleasing. While its low efficiency generates a lot of heat and requires substantial heatsinks, its straightforward design and excellent sound quality have made it a popular choice for hobbyists and a foundational circuit in the history of audio electronics.