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Audio Research LS 15
https://www.tnt-audio.com/ampli/ls15e.html
The LS 15 under test replaces the previous preamps LS2/2B mkII. It is a line preamplifier equipped with four twin-triodes (6922 in class A) while the power supply section is "solid state", that is, no tube rectifier has been used. The LS 15 has an on-board microprocessor that controls a 70-step electronic relay attenuator (volume control) and a 5 position input selector.
Audio Research LS-15 | Tube | Audiogon
https://www.audiogon.com/listings/lis9gghg-audio-research-ls-15-tube
This is an unmodified Audio Research LS15 Line Level Preamp. This model was released in 1996 as an all new design that replaced the LS2B Mk II. Its basic makeup is an all-tube gain using four 6922 twin triode tubes, and it incorporates a fully differential, zero feedback balanced circuit with electronically regulated high and low-voltage power supplies.
Nature of the Audio Research LS5 MKII | diyAudio
https://www.diyaudio.com/community/threads/nature-of-the-audio-research-ls5-mkii.309080/
2017-06-16 4:29 pm. #1. Just bought a Audio Research LS5 MKII preamp which as you probably all know fully balanced configured from input to output. Consistency (and cost) dictated around 1995 when many highend audio firms adopted the balanced setup, that one could skip cinch/RCA connectors all together, at least AR did so on my LS5 MKII.
Audio Research LS5 preamplifier & BL2 input controller ...
https://www.stereophile.com/content/audio-research-ls5-preamplifier-bl2-input-controller
The Audio Research LS5 preamplifier is a superbly musical product. It provides the best of what tubes can do without the euphonic colorations of some tubed preamps. In relation to Audio Research's very successful LS2 and LS2B, the LS5 clearly operates at another level of performance (footnote 2).
Audio Research LS2B MKII - SkyFi Audio
https://skyfiaudio.com/products/audio-research-ls2b-mkii-tube-solid-state-hybrid-line-stage-preamplifier
The Audio Research LS2 preamp came in multiple versions and variations beginning in 1991. Line stage in ARC terminology means that it does not include a phono preamplifier. This version, the LS2B MKII released in 1992, is the last and best of them all. It features balanced inputs and outputs (hence the 'B"), and remot
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