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The SP20 is fully balanced, pure Class-A with zero feedback. There are seven levels of voltage regulation, a large power supply, and a very low-noise R-core power transformer. Both the line and phono stages feature low-noise JFET inputs and 6H30 (2 per section) outputs. The latest high performance coupling and bypass capacitors are used in both stages. Both the line stage and phono preamplifier offer extraordinary frequency response and low noise. The phono section provides 58dB of gain, so the SP20 can be used with a wide variety of phono cartridges, including moderately low output moving coils.
Great condition pre-owned Audio Research SP20 Preamplifier.
Unit come in its original box and packaging with manual, power cord and remote.
The unit is rated a 8 out of 10 due to wear consistent with use. There is a small ding on one side of the unit. (see photos).
Line: ± 0.3dB 2 Hz to 80 kHz; -3dB 0.8Hz to 220 kHz. Phono: ± 0.1dB of RIAA 10Hz to 20kHz; ± 0.4dB 5Hz to 80kHz. Headphone: ± 0.05dB 20Hz to 20kHz; -3dB 0.8Hz to 220kHz.
Line: < .003% at 2V RMS, Bal output. Phono: < .005% at 3V RMS output, to Record output. Headphone: < .009% at 1V RMS output.
NOISE & HUM
Line: <-101dBV volume at max. Phono: < -77dBV to Record output. Headphone: < -88dBV volume at max.
Line: 13.8dB, Processor: 0dB. Phono: 58dB @ 1KHz to Record output. Headphone: 11.3dB.
Line: 2V RMS (1V RMS SE) into 200k ohms balanced load (maximum balanced output capability is 18V RMS at less than .5% THD+N at 1kHz.). Phono: 0.5V RMS into 100k load at Record output (maximum output capability is 25V RMS). Headphone: 6V RMS maximum into 30 to 300 ohm load.
Electronically regulated low and high voltage supplies. Automatic 30 sec. warm-up/brown-out mute. Line regulation better than .01%.