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ARCDB

    https://www.arcdb.ws/model/LS25#:~:text=Inside%2C%20the%20LS25%20is%20pure%20Class-A%20operation%20Audio,soundstage%20focus%20and%20plenty%20of%20deep%20bass%20impact.
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Audio Research LS25 Preamp Reviewed - HomeTheaterReview

    https://hometheaterreview.com/down-scaling-as-opposed/
    Specs were impressive, too: frequency response is +/-0.5dB from 1Hz to 200kHz, with -3dB points at 0.3Hz and better than 400kHz, distortion less than 0.01 percent at 2V RMS output. Gain was 12.3dB...

ARCDB

    https://www.arcdb.ws/model/LS25
    LS25/LS25 MKII manual LS25 schematic and parts list LS25 MKII schematic Specifications Frequency response ±.5dB, 1.0Hz to 100kHz -3dB pionts below 0.2Hz and 400kHz Distortion (THD) Less than .01% at 2V RMS output Noise & hum 14µV RMS residual IHF weighted balanced noise output with gain control at minimum (103dB below 2V RMS output). Gain

Audio Research LS-25 Vacuum Tube Preamplifier Manual ...

    https://www.hifiengine.com/manual_library/audio-research/ls-25.shtml
    Frequency response: 0.2Hz to 400kHz. Total harmonic distortion: 0.01%. Gain: 12dB (line) Signal to noise ratio: 103dB (line) Output: 2V (Pre out), 40V (Pre out Max) Valve complement: 4 x ECC88/6922. Dimensions: 480 x 134 x 298mm. Weight: 8.2kg.

Audio Research LS25MKII Preamplifier Preamplifiers user ...

    http://www.audioreview.com/product/amplification/preamplifiers/audio-research/ls25mkii-preamplifier.html
    The LS25 MkII very high quality, places stiff challenges to all of the known competition. Sound stage is huge and 3-dimensional with lots of detail, stereo imaging is excellent, one can actually hear the positioning of the instruments and voices as …

Audio Research LS25 Tube Reference Level Preamp in …

    https://reverb.com/item/49380494-audio-research-ls25-tube-reference-level-preamp-in-silver
    OVERVIEW: PARTIAL TRADES CONSIDERED. Great condition Audio Research Silver Tube LS25 Preamp, provided in silver finish, one owner, all very good tubes with plenty of life, recently checked and calibrated, no repairs, modifications or remote, tested and working normally and available for audition in Fort Myers, Florida.

Audio Research LS25 Preamplifiers user reviews : 4.9 out ...

    http://www.audioreview.com/product/amplification/preamplifiers/audio-research/ls25.html
    Audio Research LS25 Preamplifiers . DESCRIPTION hybrid tube stereo preamp. USER REVIEWS . Next 10. Showing 1-10 of 18 [Apr 18, 2019] dockaye. Strength: I combined a Mark Levinson amp and an LS25. The best of both worlds. I enjoy both analog and digital. Over the years I’ve leaned the importance of speaker placement, my Teals!

Audio Research LS 25 MkII compared to actual AR production

    https://forum.audiogon.com/discussions/audio-research-ls-25-mkii-compared-to-actual-ar-production
    DMA 200 S2 input impedance is 10.000 ohms and AR LS 25 MkII is 320 ohm in single-ended (now is connected in Single Ended, not the 600 ohm balanced). The general thumb rule of 10x is respected and the most restricted Audio Research thumb rule of 30x is in the limits. In the facts, i.e. listening, LS25mkII sounds great with no roll off or problems.

LS28 - Audio Research

    https://audioresearch.com/wp-content/uploads/2019/03/LS28-Manual.pdf
    Since 1970, Audio Research has been creating some of the world’s finest audio equipment. Each piece is handcrafted in Minnesota, and has been designed to provide many years of listening enjoyment. ... Specifications 18 18 18 18 20 21. 5 Warnings • To prevent fire, or shock hazard, do not expose your LS28 to rain or moisture.

ARCDB

    https://www.arcdb.ws/model/LS2
    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 …

Audio Research LS-17 Vacuum Tube Preamplifier Manual ...

    https://www.hifiengine.com/manual_library/audio-research/ls-17.shtml
    Specifications. Frequency response: 0.5Hz to 160kHz. Total harmonic distortion: 0.01%. Gain: 12dB (line) Signal to noise ratio: 101dB (line) Output: 2V (Pre out), 15V (Pre out Max) Valve complement: 2-6H30P dual triode. Dimensions: 480 x 134 x …

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