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InformationAudio Research (sold)
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The LS7 stereo line preamplifier featuring all-tube circuits that deliver rich, satisfying sound and world-renowned Audio Research construction. This down-to-earth audio components that are capable of truly out-of-this-world performance.
(on hold)
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Frequency response |
± .5dB, 1.0Hz to 100kHz -3dB points below 0.1Hz and above 300kHz |
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Distortion (THD) |
Less than .01% at 2V RMS output. (Typically .005% in midband) |
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Noise & hum |
15µV RMS maximum IHF weighted noise at main output with gain control minimum (more than 102dB below 2V RMS output) |
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Gain |
Main output - 13dB unbalanced |
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Tape output - 0dB |
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Input impedance |
100K ohms. |
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Output impedance |
200 ohms main output. Recommended load 60K ohms and 100pF (20K ohms minimum and 1000pF maximum) |
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Output polarity |
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Maximum inputs |
20V maximum |
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Rated outputs |
2V RMS 1Hz to 100kHz, all outputs, 60K ohm load (maximum output 25V RMS at 1/2% THD into 100K ohms) |
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Power supplies |
Electronically-regulated low and high voltage supplies. Line regulation better than .01% |
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Tube complement |
(4) 6922/E88cc dual triode |
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Power requirements |
100-135VAC 60Hz (200-270VAC 50/60Hz) 25 watts minimum |
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Other |
Inputs (5): tape, tuner, CD, video, aux Controls: Gain, input selector Toggle switches: power/off, mute/operate |