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Audio Research Reference Two preamplifier:
Sidebar 1: Specifications Description: Remote-controlled, fully balanced, vacuum-tube preamplifier. Tube complement: eight 6922 dual-triodes; in power supply, one each 5AR4, 6L6GC, and 6922. Voltage Gain: 18dB balanced, 12dB single-ended. Frequency response: 0.5Hz-60kHz, +0/-3dB at rated output. Hum and noise: 20µV RMS residual IHF-weighted noise output with gain control set to its minimum (100dB below 2V RMS balanced output, 97dB below 1V RMS SE output). Distortion: <0.015% at 2V RMS balanced output. Output impedance: 400 ohms balanced, 200 ohms single-ended. Recommended load: 20k ohms minimum resistance and 2nF maximum capacitance. Input impedance: 132k ohms balanced, 66k ohms single-ended.
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