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Audio Research Reference 75 power amplifier - Stereophile.com
https://www.stereophile.com/content/audio-research-reference-75-power-amplifier#:~:text=The%20Reference%2075%20%28%249000%29%20is%20similar%20to%20the,150%2C%20and%20eight%206550Cs%20in%20the%20Ref%20110.
Audio Research REF 110 or Ref 75 - Audiogon Discussion Forum
https://forum.audiogon.com/discussions/audio-research-ref-110-or-ref-75
I have the reference 75 and auditioned it on wilson Duettes, a different speaker I know. I compared it with a Ref 110, upgraded with KT120 tubes and I found the Ref 75 significantly better and certainly powerful enough for the speakers. When I auditioned the amp, it was on the recommendation of a review in a UK magazine.
Audio Research Reference 75 power amplifier - …
https://www.stereophile.com/content/audio-research-reference-75-power-amplifier
The Reference 75 ($9000) is similar to the Ref 110 and Ref 150 in that all three use input circuits using direct-coupled JFETs and a 6H30 tube. However, the Ref 75 has only four Tungsol KT120 output tubes (in ARC's ultralinear "partially cathode coupled" topology), compared with eight in the Ref 150, and eight 6550Cs in the Ref 110.
Audio Research Reference 75 power amplifier Page 2 ...
https://www.stereophile.com/content/audio-research-reference-75-power-amplifier-page-2
The Ref 75's bass definition was fairly close to the Ref 110's, but bass attacks were more articulate and bass pitches more easily followed through the 75. The Ref 75 also had a much wider dynamic range, with more subtle gradations of dynamics, as well as more "jump factor."
Audio Research Reference 75 silver | Tube | Audiogon
https://www.audiogon.com/listings/lisa3ghj-audio-research-reference-75-silver-tube
The Ref 75's bass definition was fairly close to the Ref 110's, but bass attacks were more articulate and bass pitches more easily followed through the 75. The Ref 75 also had a much wider dynamic range, with more subtle gradations of dynamics, as well as more "jump factor."
KT150 tubes in a Ref 110 - Has anybody tried it
https://www.audioshark.org/audio-research-corporation-arc-36/kt150-tubes-ref-110-has-anybody-tried-14734.html
It will save me from buying a lower powered valve amp as the Ref 110 will only be used to drive midrange and tweeters. In fact I am amazed that your Ref 75 is powerful enough to drive your Wilson's, which just re-affirms my thinking that 100+ watts of valve power for midrange and tweeters could be overkill. Take care J July 13, 2018, 10:32 AM #4
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