STATUS - SOLD

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Description :
The LS7 has excellent dynamics, superb detail, great imaging and a neutral presentation (meaning it adds few significant artifacts to the image, including no emphasis of any portion of the frequency range). The ability of the LS7 to resolve detail is especially evident on complex passages such as massed strings and choral recordings or on unnaturally recorded (or "assembled") rock recordings with studio-induced "grunge".

Specifications :
Type..........................................................Tube Preamplifier
Frequency response...................................± .5dB, 1.0Hz to 100kHz -3dB points below 0.1Hz and above 300kHz
Distortion (THD)..........................................Less than .01% at 2V RMS output. (Typically .005% in midband)
Noise & hum..............................................15μV RMS maximum IHF weighted noise at main output with gain control minimum
.................................................................(more than 102dB below 2V RMS output)
Gain...........................................................Main output - 13dB unbalanced, Tape output - 0dB
Input impedance..........................................100K ohms
Output impedance.......................................200 ohms main output. Recommended load 60K ohms and 100pF
..................................................................(20K ohms minimum and 1000pF maximum)
Maximum inputs..........................................20V maximum
Rated outputs..............................................2V RMS 1Hz to 100kHz, all outputs, 60K ohm load
...................................................................(maximum output 25V RMS at 1/2% THD into 100K ohms)
Power supplies.............................................Electronically-regulated low and high voltage supplies.
...................................................................Line regulation better than .01%
Tube complement.........................................(4) 6922/E88cc dual triode
Power consumption......................................100-135VAC 60Hz (200-270VAC 50/60Hz) 25 watts minimum
Inputs (5)......................................................tape, tuner, CD, video, aux
Controls.......................................................Gain, input selector
Toggle switches............................................power/off, mute/operate
Weight.........................................................5kg
Dimensions(w x d x h)...................................48.5 x 32 x 14 cm

Miscellaneous :
Made in........................................................USA
Condition.......................................................9 / 10 (Good condition)

Reviews :
http://www.audioreview.com/cat/amplification/preamplifiers/audio-research/ls7/PRD_118171_1591crx.aspx

Product Information :
http://www.arcdb.ws/LS7/LS7.html
http://www.vintageaudio.it/Audio_Research/LS7.html
http://www.arcdb.ws/Common%20Flyers/LS7_VT60/ARC_LS7_VT60_flyer2.jpg