Audio Research LS28 vacuum tube preamplifier

$14,495 EXCLUSIVE TO WEST COAST MIDLAND

LS28

Line Stage Preamplifier

The LS28 line stage is a flexible and intuitive preamplifier. Four balanced and four single-ended inputs, and two sets of both balanced and single-ended outputs, allow maximum connectivity. The straightforward menu allows control of numerous parameters, including input naming, tube hours, auto shutdown, and home theater passthrough. Phase invert and mono are also standard functions. At the heart of the LS28 are four 6H30 vacuum tubes in the analog circuit. While the LS28 is the perfect match for any Audio Research amplifier, it has been designed to work with nearly any amplifier on the market today.

Series need the ability to provide the full benefit of this new sonic landscape. Increasing the tube count to six in the analog section, and advancements in the power supply improved both macro- and microdynamics and lowered distortion.

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Overview

  • TECHNICAL SPECIFICATION
    FREQUENCY RESPONSE
    +0-3dB, 0.4Hz to 200kHz at rated output (Balanced, 200k ohms load)THD+NOISE
    Less than .007% at 2V RMS BAL output.

    NOISE
    Less than -100dBv at max volume (103).

    DYNAMIC RANGE
    122dB (AES17).

    CROSSTALK
    -105dB

    GAIN
    Main output: 18.5dB balanced output. (12.5dB SE output.)  Record output: 0dB (Processor input: 0dB balanced out).

    INPUT IMPEDANCE
    100K ohms Balanced, 50K ohms SE. 8 Inputs – 4 balanced, 4 single-ended.

    OUTPUT IMPEDANCE
    600 ohms Balanced, 300 ohms SE Main (2), 20K ohms minimum load and 2000pF maximum capacitance. Outputs (3): 2 Main, 1 Record (XLR and RCA connectors).

    OUTPUT POLARITY
    Non-inverting.MAXIMUM INPUT
    16V RMS BAL, 8V RMS SE.

    RATED OUTPUTS
    2V RMS (1V RMS SE) into 200K ohm balanced load (maximum balanced output capability is 17V RMS at less than 0.5% THD at 1kHz).

    CONTROLS
    Rotary volume selector (103 steps) and rotary input selector. Push buttons: Power, Menu, Enter, Mono, Invert, Mute

    POWER SUPPLIES
    Electronically regulated low and high voltage supplies.  Automatic 45 sec. warm-up/brown-out mute.  Line regulation better than .01%.

    TUBE COMPLEMENT
    (4) 6H30P dual triode.

    POWER REQUIREMENTS
    105-125VAC 60Hz (200-250VAC 50/60Hz) 130 watts maximum.

    STANDBY
    2W

 

Additional Information

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