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About the SP15
The Audio Research SP15 is a high-end hybrid preamplifier introduced in 1988. It utilizes both vacuum tubes and semiconductors as gain devices, with the tubes exclusively used in the phono section. This design allows for improved resistance to input overloads and reduced noise levels compared to its predecessor, the SP11. The SP15 features a dual-chassis design, separating the power supply from the active amplification components to minimize interference. It includes a built-in phono stage with selectable input impedances (47K, 100, 30, 10, 3 ohms) and a high-level input impedance of 20K ohms or higher. The preamplifier offers a five-level attenuation control for volume adjustment and includes an external power supply unit (SP15PS) for powering additional components.
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