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Burning Blue Audio
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Manufacturer of portable USB headphone amplifiers and desktop amps for digital and computer audio. Dedicated to headphone amplification.
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Sakuma System
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An association for audiophiles and manufacture of hand made vacuum tube amplifiers. Japan.
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darTZeel
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Makes a power amplifier and preamplifier. Switzerland. [English, French]
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Halcro Amplifiers
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Manufacturers of mono, power, integrated, and pre amplifiers for stereo reproduction and home theater.
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