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Audio Research Reference 600 mk II
https://www.highperformancestereo.com/audio-research-reference-600-mk-ii.html
The REFERENCE 600MKII has sufficient bias adjustment range to allow the use of any of the following output tube types: 6550, 6550B, 6550C, KT88, KT90, KT91, KT100. The REFERENCE 600MKII as supplied from Audio Research is equipped with the Russian 6550C, which is our current choice for reliability and long service.
Audio Research REF600 MKI MKII - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-ref600-mki-mkii
Audio Research REF600 MKI MKII Can anyone tell me, is that worth to upgrade the AR600 MKI to MKII, and anyproblem with this giant AR600.Please advice.Thanks! hifi …
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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