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Audio Research REF600 MKI MKII - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-ref600-mki-mkii
Hifi.. i would definately not upgrade to the mkII version of the ref 600's if there is a mkIII version in development. I would assume the mkIII may have a similar redesign of the input stage using the new J-FET topology and 6H30 driver tubes as used on the latest ref 300 mkII's.
Audio Research Reference 600 mk II
https://www.highperformancestereo.com/audio-research-reference-600-mk-ii.html
Audio Research Reference 600 mk II. Be the first to review this product. SKU: ARCReference600MKII. The ultimate high power tubed amps. POWER OUTPUT: 500 watts continuous at 16 ohms from 20Hz to 20kHz with less than 1% total harmonic distortion (typically less than .05% at 1 watt).
ARCDB
https://www.arcdb.ws/REF600/REF600.html
The REFERENCE 600 as supplied from Audio Research is equipped with Russian 6550C, which is our current choice for reliability and long service. REFERENCE 600 MK II: (8 matched pairs) 6550C power output, (4) 6550C regulators, (3) 6922 regulators, (8) 6922 driver, (2) 6922 input.
Audio Research Reference 600 Power Amps Reviewed ...
https://hometheaterreview.com/audio-research-reference-600-power-amps-reviewed/
Audio Research Reference 600 Power Amps Reviewed. This amp means serious business. If the massive size didn't give it away, maybe the VU meters did. It's a tube amp, but its rated at upwards of ...
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