The LS15 is an all-new line-level preamplifier which replaces the LS2/2BMKII series. It features all-tube gain (12 dB standard) using four 6922 twin triode tubes in a Class A, fully differential zero feedback (balanced) circuit with electronically regulated high and low-voltage supplies. The LS15 includes handheld IR remote control of all essential front-panel functions. An onboard microprocessor controls a 70-step electronic relay attenuator and 5-position input selector. An additional Direct input (balanced) provides a highest-signal-purity path for your favorite music source. A total of two balanced and five single-ended (including tape) dedicated inputs are included.
Main outputs are balanced and single-ended, with one pair of single-ended tape outputs. Spring-activated toggle switches activate electronic relays to control key functions with minimal signal degradation. Factory-set gain of 18 dB is optional at no charge. The anodized front panel is available in natural aluminum or black, cabinet style or with rack-mount holes.
FREQUENCY RESPONSE
± .5dB, 2Hz to 30kHz at rated output. -3dB points below 0.3Hz and above 80kHz.
DISTORTION (THD)
Less than .01% at 2V RMS balanced output
NOISE & HUM
25µV RMS residual IHF weighted balanced noise output with gain control at minimum, 98dB below 2V RMS output
GAIN
Main output: 12.5dB Balanced, 6.5dB SE. Tape output: 0dB.
INPUT IMPEDANCE
200K ohms balanced, 100K ohms SE
OUTPUT IMPEDANCE
600 ohms Balanced, 300 ohms SE Main (2), 40K ohms minimum load and 1000pF maximum capacitance.
MAXIMUM INPUTS
14V RMS maximum balanced, 7V RMS SE.
RATED OUTPUTS
2V RMS (1V RMS SE) into 200K ohm Balanced load (maximum Balanced output capability is 30V RMS at less than 1% THD at 1kHz
POWER SUPPLIES
Electronically regulated low and high voltage supplies. Automatic 30 second warmup mute. Automatic brown-out mute.
TUBE COMPLEMENT
(4) 6922/E88CC
POWER REQUIREMENTS
100-135VAC 60Hz (200-270VAC 50/60Hz) 35 watts maximum
OTHER
Vacuum tube audio circuit, solid-state power supply. Inputs: SE1, SE2, SE3, SE4, Bal, Direct (Bal) and Monitor (SE). Outputs: 2 Main Bal, 1 Main SE, 1 Record SE
DIMENSIONS
19″ (48 cm) W x 5 ¼” (13.3 cm) H (standard rack panel) x 10½” (26.7 cm) D. Handles extend 1½” (3.8 cm) forward of the front panel.
WEIGHT
11.6 lbs. (5.3 kg) Net; 20 lbs.(9.1 kg) Shipping.
