Audio Research Tube Preamplifier LS7

This is an auction, not a classified listing. You're bidding on the Audio Research LS7 tube preamplifier. The LS7 stereo line preamplifier features all-tube circuits that deliver rich, satisfying sound and world-renowned Audio Research construction. The item is well maintained and doesn't have any blemishes. The stock tubes were upgraded to NOS Amperex Holland from Vintage Tube Services. I'm the second owner and do not have the original box or manual - both can be obtained from ARC. I guarantee the item will arrive at your destination without incident or complaint. Professional packing and standard UPS ground shipping in the continental U.S. will be paid by seller. If you need it sooner, we'll work out the details once the auction closes and you're awarded the sale.

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

Operating voltage
Equipped for the U.S. market - 120 volts AC

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).