The SP20 is a full-function line stage which incorporates a phono preamplifier and a ¼” headphone jack. Front panel controls have been minimized to two rotary controls and an interactive touch screen display, along with power, mute and output selector buttons.
About this product
Super condition store demo Audio Research SP20 Tube Preamplifier, in Silver finish. Unit comes in original box and packing, with remote control, power cord, and owner’s manual.
Unit is rated 7/10 for light cosmetic wear consistent with use including: a small mark on front face above display, two marks on right side of unit, and one faint mark on rear panel (see photos). These marks are purely cosmetic and do not affect unit functionality.
Line: +/- 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
Line: 13.8dB, Processor: 0dB
Phono: 58dB @ 1KHz to Record output
Line: <-101dBV volume at max.
Phono: <-77dBV to Record output
Headphone: 105dB Balanced output
Phono: >76dB to Record output
SIGNAL TO NOISE RATIO
Line: >125dB Balanced output
Phono: >94dB to Record output
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.
120k ohms Balanced, 60k ohms SE; Phono impedance programmable (100, 200, 500, 1000 or 47k ohms w/200pf unbalanced).
500 ohms Balanced, 250 ohms SE; 1000 ohms Record Out SE; <.05 ohms Headphone SE.
MAXIMUM INPUT LINE
19V RMS Balanced, 9V RMS SE. Phono: 70mV RMS at 1kHz.
Rotary Volume (104 steps), Rotary Input selector. Push
Power, Mute, SPKR Off. Interactive Touch Screen. Rear RS-232 control and Remote IR input.
Electronically regulated low and high voltage supplies. Automatic 30 sec. warm-up/brown-out mute. Line regulation better than .01%.
4 6H30 dual triode.
100 – 135VAC 60Hz (200 – 270VAC 50/60Hz) 77 watts maximum. Standby 2.7 watts.
Width 19" (48 cm)
Height 5.25"(13.4 cm) (standard rack panel)
Depth 16.5"(42 cm) D.
17.8 lbs. (7.4 kg) Net;
27.8 lbs. (10.5 kg) Shipping.
If you have any questions about this product, please call 734.662.3595 and ask for Richard or Amanda, or contact us via the form below. We make every effort to update our ads quickly when inventory fluctuates, but we encourage you to call and check product availability, as we are also a brick and mortar store. All electronics support U.S. voltages only, unless otherwise indicated. We do not change voltages. Paragon offers free shipping within the continental United States for orders under 70 pounds. If your order does not qualify for free shipping, we will be happy to provide you with a shipping quote.