Audio Research LS27 Hybrid Preamp - As Traded
Audio Research LS27 Hybrid Preamp - As Traded
Audio Research LS27 Hybrid Preamp - As Traded
Audio Research LS27 Hybrid Preamp - As Traded

Audio Research LS27 Hybrid Preamp - As Traded

$5,500.00

Audio Research LS27 Hybrid Preamp - As Traded

Condition: Excellent

The LS27 is a pure Class-A design with zero feedback, and the massive power supply is fully regulated. Gain is provided by twin 6H30 triodes. Multiple circuit changes and refinements account for greatly improved performance, including bulk power-supply storage that has been substantially increased, a new power transformer, and costly new output and bypass coupling capacitors that bring new dynamic life and even more refinement to the presentation.

FREQUENCY RESPONSE
+0-3dB, 0.2Hz to 160kHz at rated output (Balanced, 200k ohms load)
DISTORTION (THD)
Less than .01% at 2V RMS BAL output
NOISE & HUM
1.3µV RMS residual IHF weighted balanced equivalent input noise with volume at 1 (100 dB below 2V RMS output).
GAIN
Main Output : Selectable for each input: 24dB, 18dB, 12dB. Balanced output (18dB, 12dB, 6dB SE output). Record output: 0dB (Processor input: 0dB balanced).
INPUT IMPEDANCE
120K ohms Balanced, 60K ohms SE.
OUTPUT IMPEDANCE
700 ohms Balanced, 350 ohms SE Main (2). 20K ohms minimum load and 2000pF maximum capacitance
OUTPUT POLARITY
Non-inverting
MAXIMUM INPUTS
Low Gain: 48V RMS BAL, 24V RMS SE. Medium Gain: 24V RMS BAL, 12V RMS SE. High Gain: 12V RMS BAL, 6V RMS SE.
RATED OUTPUTS
2V RMS 1Hz to 100kHz into 200K ohm balanced load (maximum balanced output capability is 15V RMS at less than 0.5% THD at 1kHz)
POWER SUPPLIES
Electronically regulated low and high voltage supplies. Automatic 50 sec. warm-up/brown-out mute. Line regulation better than .01%.
TUBE COMPLEMENT
(2) 6H30P
POWER REQUIREMENTS
105-130VAC 60Hz (210-260VAC 50/60Hz) 50 watts maximum.
OTHER
Hybrid JFET/tube audio circuit, solid-state power supply. Inputs (8): Tuner, Phono, CD, Video, Aux 1, Aux 2, Monitor, Processor (XLR and RCA connectors). Outputs (3): 2 Main, 1 Main, 1 Record (XLR and RCA connectors). Controls: Rotary volume selector (104 steps) and rotary input selector. Push buttons: Power, Mono, BAL/SE, Proc, Monitor, Mute. Also remote buttons: Display, Bal L, Bal R, Hours, Invert, Gain.
DIMENSIONS
19" (48 cm) W x 5 ¼" (13.4 cm) H (standard rack panel) x 13.3" (33.8 cm) D. Handles extend 1½" (3.8 cm) forward of the front panel.
WEIGHT
16.3 lbs. (7.4 kg) Net; 23 lbs. (10.5 kg) Shipping.

Includes Box