Resource
Pass Labs
US audio manufacturer whose official catalogue covers Class A and Class AB amplifiers, preamplifiers, and headphone amplification.
Verification sources
Related resources
Pass DIY
diy
Pass DIY archive providing articles, files, historical schematics, amplifier projects, and a crossover simulator.
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Accuphase
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Accuphase manufactures high-end audio equipment including integrated amplifiers, preamplifiers, power amplifiers, and digital sources.
ATC
manufacturer
ATC produces hi-fi loudspeakers and electronics alongside active professional studio-monitoring systems.
Sources
Audionet
manufacturer
German audio manufacturer offering integrated amplifiers, preamplifiers, power amplifiers, and source components.
Sources
Benchmark Media Systems
manufacturer
Benchmark Media Systems produces digital-to-analog converters, power amplifiers, headphone amplifiers and preamplifiers.
Boulder Amplifiers
manufacturer
Boulder Amplifiers manufactures power amplifiers, preamplifiers, integrated amplifiers and DAC preamplifiers in Colorado.