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The ARC PH7 Phono Stage - The Absolute Sound
https://www.theabsolutesound.com/articles/the-arc-ph7-phono-stage
The ARC PH7 Phono Stage. The venerable Audio Research Corporation has been on quite a roll of late. Its newest-generation amps (the Reference 210 and Reference 610T) and preamp (the Reference 3), designed as always by the legendary William Zane Johnson, are across-the-board lower in distortion and coloration, higher in bandwidth, energy, and resolution, fuller in duration, …
SoundStage! Vinyl Word - Audio Research PH7 Phono Stage ...
http://www.soundstagenetwork.com/vinyl/vinyl200612.htm
The $5995 USD PH7 improves upon Audio Research’s one-third-the-price PH5 by incorporating proprietary capacitors and the same circuit-board material used in the acclaimed Reference 3 line-stage preamp. Like the Ref 3 (and unlike the PH5), the PH7 adopts vacuum-tube regulation of the power supply, where it relies upon three Russian 6H30 triodes.
Audio Research PH7 High Definition Tube Phono Stage ...
https://www.audiogon.com/listings/lisa9db0-audio-research-ph7-reference-tube-phono-stage-phono
Audio Research's PH7 Phono Stage has been making speakers disappear in high-end vinyl systems for years. Known for its upper-octave air, lifelike image size, and soundstage breadth, the PH7 now improves on bandwidth, transient speed and dynamic impact. When you need 'more' and want to hear it all, the PH7 is a wonderful phono stage.
Audio Research PH 7 or PH 6 - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-ph-7-or-ph-6
"Comparing the PH7 with the Reference Phono 2 confirmed what an excellent value the PH7 is, while acknowledging that, at twice its price, the Reference Phono 2 had the sonic chops to warrant it as no poster child for the high-end s law of diminishing returns.
ARCDB
https://www.arcdb.ws/PH7/PH7.html
The PH7 takes advantage of more recent technology developed for products like the landmark Reference 3 preamplifier, and uses an all-vacuum-tube audio stage with four 6922 twin triodes. Regulation of the power supply is also vacuum-tube, using three 6H30 triodes. Output coupling caps are the costly, advanced types proprietary to Audio Research, with power-supply energy …
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