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About the Libra
Thrax Audio Libra is a flagship two-box, fully balanced 300B tube preamplifier designed around a true differential pure Class A triode gain stage. It uses two 300B tubes per channel, features post-amplification volume control, dual-mono architecture, independent outputs for bi-amplification, a fully balanced tape loop, home theater bypass, trigger output, and an external dual-mono power supply with a choke-input rectifier. Thrax describes it as a statement preamplifier built for low noise, high transparency, and modular serviceability.
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