Audio Research SP14 Preamp with Black Faceplate

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Estate fresh! No original packaging. As pictured No remote was used on this unit. Double boxed. Shipping to US addresses onlyFREQUENCY RESPONSE High level section: ±.5dB, 5Hz to 50kHz, -3db points below 1Hz and above 200 kHz. Magnetic phono: ±.3dB of RIAA, 30Hz to 40kHz DISTORTION (THD) Less than .01% at 2V RMS output NOISE & HUM High level: (1) 70 µV RMS maximum residual unweighted wideband noise at main output with gain control minimum (98 dB below 5V RMS output) (2) More than 100dB below 1V RMS input (less than 7 µV equivalent input noise). Phono: 0.12 µV equivalent input noise, IHF weighted, shorted input (78dB below 1mV input). GAIN Phono input to tape output: 46 dB. Phono input to main output: 66 dB. High level inputs to tape output: 0 dB. High level inputs to main output: 20 dB. INPUT IMPEDANCE Line inputs: 50 K ohms. Phono: 47K ohms (provisions for any value below 47K ohms or added input capacitance for matching certain magnetic cartridges.) OUTPUT IMPEDANCE 250 ohms main output, 1000 ohms recorder output. Recommended load 60K - 100K ohms and 100pF. (20K ohms minimum and 1000pF maximum) OUTPUT POLARITY - MAXIMUM INPUTS Magnetic phono, 200mV at 1kHz (1000mV RMS, 10 kHz). High level inputs essentially overload-proof. RATED OUTPUTS 2V RMS 5 Hz to 50 kHz, all outputs; 60K ohm load (main output capability is 50V RMS output at read more

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