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About the AS133
The Line Magnetic AS-133 is a high-end vacuum tube preamplifier sold under the Analog Sound by Line Magnetic branding. It uses a Western Electric-inspired design with 6SN7 and 2A3 tubes, a 5U4G rectifier, and transformer-coupled circuitry aimed at high fidelity, flexible gain adjustment, and wide compatibility with power amplifiers. Listings and retailer descriptions identify it as a premium preamp with multiple inputs, balanced and single-ended outputs, and substantial chassis construction.
Specifications
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