Audio Research PH5 Phono Preamplifier Input Clipping Problem

In many designs low settings of the volume control may result in an inability to adjust volume in fine enough increments. I see that your REF3, however, provides 104 steps of volume adjustment, so I suspect that is not an issue in your case.

Also, in some designs channel imbalances can occur at low settings of the volume control. But again I would suspect that is not an issue with the REF3.

Finally, it is conceivable that in some designs having to operate the volume control at low settings may result in whatever sonic side-effects may be introduced by the volume control mechanism itself being worse than at higher settings. I have no knowledge, though, as to whether or not that possibility may have any applicability to the REF3. And even if it does, it would be anyone’s guess as to whether or not the possible sonic side-effects of an in-line attenuator, used with these particular components, would outweigh the possible benefit.

Best regards,
-- Al

almarg, I'd be interested in knowing if you have any favorites in the phono preamp category, care to comment?

Scott, yes, inspired by a great many overwhelmingly positive comments I've seen here and elsewhere, late last year I purchased a Herron VTPH-2 phono stage ($3650).  It is beautiful sounding, versatile, very intelligently engineered, absolutely quiet at any volume setting in my system in both LOMC and MM modes, and as many others have commented Keith Herron is a treasure to deal with.

It is offered in a choice of two gain configurations.  For the majority of applications, including mine, the lower gain version is preferable.  It provides gains of 43 db in MM mode and 64 db in MC mode.

The one slight caveat I would cite is that like your PH5 it does not provide balanced outputs, and John Atkinson's measurements of the REF3 indicate somewhat better measured performance in balanced mode than in unbalanced mode.  But even if those measured differences have any audible significance, which I doubt, I would suspect they are mainly attributable to JA having used the preamp's unbalanced outputs for the unbalanced measurements, not just the unbalanced inputs.  And I note the following statement in the body of the review:

ARC states that the long-tailed pair used in the Ref.3's input stage provides identical performance (save for the amount of gain) using either the balanced or the single-ended inputs.

Good luck.  Best regards,
-- Al
 

Yes I have noticed that one is recommended a lot.  Looks like a move from PH-5 to Herron could cost about $ 2K.  Will have to consider whether that is "reasonable" or not.  But for me, swapping gear and upgrading is part of the fun.  It seems that used versions of the Herron are hard to find.  I guess those who have them, keep them.  Did you purchase yours new?

Yes, I purchased my VTPH-2 new, directly from Keith after speaking with him on the phone. You would want to confirm with him that the lower gain version is the optimal choice for use with a 0.27 mv cartridge. I suspect that it will be, though, in part because he recommended that version for use with a 0.3 mv cartridge I was considering at the time. I ended up going with an Audio Technica AT-ART9, though, which is rated at 0.5 mv.

Best regards,
-- Al