**Price in USD** Vinyl record playback has been an integral part of Audio Research since our founding in 1970. Think back to the great phono stages built into the defining preamplifiers of their day, among them the SP3, SP6, SP8, SP10, and SP11. Even after the introduction of the compact disc in 1982, phono sections remained a revered part of our preamplifiers. The first Audio Research phono preamplifier in a separate chassis was introduced in 1992. FREQUENCY RESPONSE: ± .2dB of RIAA, 10Hz to 60kHz; 3dB points below 0.3Hz and above 300kHz. DISTORTION: Less than .002% at 1.0V RMS 1kHz output. GAIN: Selectable 51dB (Low), 74dB (High) at1kHz BAL; 45dB (Low), 68dB (High) at1kHz SE. (MC & MM compatible). BUTTONS: Front (2) Power, Mute. INPUT IMPEDANCE: 47K ohms and 100pF SE. Selectable loads 1000, 500, 200, 100, 50 ohms and Custom. PHONO EQUALIZATION: (Selectable) RIAA, Columbia, Decca. OUTPUT POLARITY Non inverting. OUTPUT IMPEDANCE: 200 ohms SE, 400 ohms balanced. Recommended load 50K-100K ohms and 100pF. (10K ohms minimum and 2000pF maximum). MAXIMUM INPUT: 250mV RMS at 1kHz (680 mV RMS at10kHz). RATED OUTPUTS: 0.5V RMS 10Hz to 20kHz, 100K ohm load (output capability is 80V RMS BAL output at 1/2% THD at1kHz, 40V SE). POWER SUPPLIES: Electronically regulated low and high voltage supplies. Automatic 40 sec. warm-up/brown-out mute. Line regulation better than .01%. NOISE: 0.22uV equivalent input noise, IHF weighted, shorted(Low Gain) input (73 dB below 1mV 1kHz input). 0.055uV equivalent input noise (High Gain) (65dB below 0.1mV 1kHz input). TUBE COMPLEMENT: (8)-6H30P dual triodes, plus (2 each) 6550C and 6H30P in power supply. POWER REQUIREMENTS: 100-135VAC 60Hz (200-270VAC 50/60Hz) 235 watts maximum. Standby 0.8 watts.
