Frequency response: ±.5dB, 1Hz to 100kHz.
LS5 MKIII: ±.5dB, 1Hz to 200kHz -3dB points below 0.3Hz and above 400kHz.
Distortion (THD): Less than .01% at 2V RMS output (typically <0.005% in midband)
LS5 MKIII: Less than .005% at 2V RMS output
Noise & hum: 40µV RMS residual IHF weighted balanced noise output with gain control minimum, 12dB gain selected (94dB below 2V RMS output)
LS5 MKIII: 13µV RMS residual IHF weighted balanced noise output with gain control minimum (12dB gain), (103dB below 2V RMS output)
Gain: (Balanced Differential): Main output 30dB/12dB switchable.
Tape output: 0dB.
Input impedance: 200K ohms balanced
Output impedance: 400 ohms balanced Main (2), 20K ohms minimum load and 2000pF maximum capacitance.
Output polarity:
Maximum inputs: LS5 MKIII: 20V
Rated outputs: LS5 MKIII: 2V RMS 1Hz to 100kHz into 100K ohm balanced load (maximum balanced output capability is 30V RMS at less than 0.5% THD at apability is 30V RMS at less than 0.5% THD at 1kHz).
Power supplies: LS5 MKIII: Electronically regulated low and high voltage supplies. Auto 45 sec. warm-up/brown-out mute. Toroid power transformer. Line regulation better than .01%.
Tube complement: LS5: (4) 6922, (6)12BH7
LS5 MKII: (10) 6922
LS5 MKIII: (8) 6922/E88cc dual triode. (Vacuum tube audio circuit, solid-state power supply.)
Power requirements: 100-135VAC 60Hz (200-270VAC 50/60Hz) 100 watts maximum.
Other
Dimensions: 19" (48 cm) W x 5¼" (13.4 cm) H (standard rack panel) x 11¾" (29.8 cm) D. Handles extend 1½" (3.8 cm) forward of the front panel. Rear chassis fittings extend 7/8" (2.3 cm).
Weight: 19 lbs. Net 29 lbs. Shipping
LS5 MKIII: 17.5 lbs. (8.0 kg) Net; 30 lbs. (13.6 kg) Shipping.