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Estimated price (community-sourced)
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About the SP9
The Audio Research SP9 is a hybrid stereo preamplifier introduced in 1987, using two 6DJ8/ECC88 tubes in conjunction with a solid-state FET output stage. Its phono section provides RIAA equalization, adjustable cartridge resistance and capacitance, and 67dB gain to the main outputs, supporting moving-magnet and suitable moving-coil cartridges. The line stage offers a 5Hz–50kHz frequency response, while the phono response is 30Hz–40kHz, with total harmonic distortion specified at approximately 0.01%. The SP9 includes multiple line-level inputs, tape-monitor facilities, regulated power supplies, and a toroidal power transformer. It is a discontinued high-end preamplifier known for combining tube-based signal processing with solid-state drive capability.
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