Audio Research PH6 Phono Stage - How is it?


I know most of Audio Research stuff is top end with little complaints about anything they make. I like tube gear and have more of a preference for the tube sound but looking for a phono stage with little noise. I know the PH8 reference phono stage is a true reference standard but way out of my price range. So that brings me to the PH6, which retails for around $3,500. Not too many reviews on this one and hasn't been compared to other phono stages at a similar price point. There are some good competition at this price, especially the Herron VTPH2, which is also a great phono stage. Does anyone have any information about the PH6?

My current system is Primaluna Dialogue HP Integrated Amp, VPI Prime turntable, Ortofon Quintet Black MC cartridge, Sonus Faber Olympica III speakers. Much appreciation!
djfst

Showing 1 response by almarg

The somewhat low efficiency of your speakers (about 85 db at 1 meter on a per watt basis, which can be inferred from the measurements here), in combination with the 0.3 mv rated output of your cartridge and the approximately 0.32 volt sensitivity of your integrated amp, raises some concern in my mind about the adequacy of the 58 db gain of the PH6. Particularly if you are using the amp in triode mode, and particularly if your listening includes material having wide dynamic range (i.e., a wide DIFFERENCE in volume between the loudest and the softest notes, such as many classical symphonic recordings).

Under those circumstances I suspect that you would be using the amp's volume control roughly in the 3 to 4 o'clock position (assuming the min and max positions of the control are at roughly 7 and 5 o'clock, respectively). Which raises concerns not only with respect to noise generated by the phono stage, but perhaps also with respect to noise generated by the integrated amp.

What I'd suggest at this point is that with no music playing you turn up the volume control to the point where noise levels become objectionable, and let us know the corresponding position of the control. Also, let us know if you are using triode or ultralinear mode, and if your listening includes material having particularly wide dynamic range.

Good luck. Regards,
-- Al