audio research
LS7

Description
Tube stereo line stage.

From the ARC website

If you appreciate the natural-sounding reproduction of music made possible by vacuum-tube technology, but were afraid of the hassles and the prohibitive pricehave we got news for you. Audio Research, the 25- year leader in vacuum-tube technology dedicated to music reproduction, has made a vacuum-tube music system more affordable than ever. It's the New LS7 stereo line preamplifier and VT60 stereo power amplifier, both featuring new, all-tube circuits that deliver rich, satisfying sound and world-renowned Audio Research construction. Two down-to-earth audio components that are capable of truly out-of-this-world performance.

Introduced
1995

Discontinued
1997

Revisions
-

Options
-

MSRP (US new retail)
$1,495

Specifications

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)
Output polarity  
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 requirements 100-135VAC 60Hz (200-270VAC 50/60Hz) 25 watts minimum
Other Inputs (5): tape, tuner, CD, video, aux
Controls: Gain, input selector
Toggle switches: power/off, mute/operate
Dimensions 19" (48 cm) W x 5 1/4" (13.4 cm) H (standard rack panel) x 10 1/4" (26 cm) D. Handles extend 1 1/2" (3.8 cm) forward of front panel. Rear chassis fittings extend 1/2" (1.3 cm).
Weight 9.8 lbs. (4.5 kg) Net, 18.8 lbs. (8.5 kg) Shipping.

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