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About the SP9
The Audio Research SP-9 is a hybrid stereo preamplifier introduced in 1987, combining vacuum tubes and solid-state FET technology to deliver high-fidelity audio performance. It features one phono input compatible with moving-magnet cartridges and suitable for medium-output moving-coil cartridges due to its low noise and adjustable loading. The unit offers six line-level inputs and two tape loops, with sophisticated power supply regulation and a toroidal transformer for low noise and interference. The SP-9 provides a frequency response of approximately 5Hz to 50kHz (line level) and 30Hz to 40kHz (RIAA phono), with total harmonic distortion around 0.01% at 2V output. It uses two 6DJ8/ECC88 tubes in the signal path and has gold-plated input/output connectors. The preamplifier is noted for its warm tube sound, reliability, and excellent build quality, making it a valued classic in high-end audio. It was
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