What are the specs for the Audio Research LS2?

Frequency Response:

± .5dB, 1Hz to 100Hz, -3dB points below 0.1Hz and above 300kHz

Distortion:

Less than .01% at 2V RMS output (typically less than .005% in midband)

Noise & Hum:

20µV RMS residual 1HF weighted noise at main unbalanced output with gain at minimum (100dB below 2V RMS output). xxx Balanced input noise 100dB below 1V input.

Gain:

LS2: Main Output: 18dB. Balanced output: 24dB. Tape output: 0dB (Optional 12dB gain reduction). LS2 MKII: Main Output: 18dB. Balanced output: 24dB. Tape output: 0dB (Optional 9dB gain reduction)

Input Impedance:

LS2: 50K ohms. LS2: 50K ohms unbalanced, 3 megaohm balanced.

Output Impedance:

LS2: 200 ohms main output. 500 ohms Balanced 1, Balanced 2 (10K ohms minimum load and 2000pF maximum capacitance). LS2 MKII: 200 ohms main output. 400 ohms Balanced 1, Balanced 2 (10K ohms minimum load and 2000pF maximum capacitance)

Maximum Inputs:

LS2: 20V maximum. LS2 MKII: 20V maximum unbalanced, 8.5V maximum balanced.

Rated Output:

LS2: 2V RMS 1Hz to 100kHz into 60K ohm load (maximum output capability is 10V RMS (20V RMS balanced) output at 05% THD at 1kHz into a 10K ohm load). LS2 MKII: 2V RMS 1Hz to 100kHz into 60K ohm load (maximum output capability is 30V RMS (60V RMS balanced) output at 05% THD at 1kHz into a 10K ohm load)

Power Supplies:

Electronically-regulated low and high voltage supplies. Two transformers (toroid for high voltage). Line regulation better than .01%

Tube Complement:

LS2: (1) 6DJ8/ECC88. LS2 MKII: (1) 6922.

Power Requirements:

100-135VAC 60Hz (200-270VAC 50/60Hz) 60 watts maximum

Other:

Hybrid FET/Tube audio circuit, solid-state power supply

Dimensions:

19" (48 cm) W x 5 ¼" (13.4cm) H (standard rack panel) x 10 ¼" (26cm) D. Handles extend 1 ⅝" (4.1cm) forward of front panel. Rear chassis fittings extend ⅞" (2.3cm).

Weight:

LS2: 13 lbs. (5.9 kg) Net; 21lbs.(9.5 kg) Shipping. LS2B MKII: 14 lbs. (6.0 kg) Net; 22lbs.(10 kg) Shipping.