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phono pre-amp being replaced

Hi guys long time no talk to.

So I'm reaching out to the community to get some feedback. I recently purchased a Lyra Kleos phono cartridge. Love the cartridge by the way. One of the best sounding carts in its price range and more that I have heard. With that said I currently have an ARC PH-7 phono stage. Love that piece also. Its very natural sounding and just produces a lovely sound. However in regards to cartridge loading its just not the best match for the Kleos. I understood that when I bought the cartridge, but I really wanted the Kleos so I pulled the trigger. Don't get me wrong the sound is amazing with the two however the PH-7 has a fixed gain of 57.5 DB. with the Kleos being a .5mv output I have lost about 8-10 DB of gain in reference to my medium output Dynavector that the Kleos replaced. I think the optimal gain for .5mv is somewhere in the neighborhood of 60-61DB. So that is a little background. Here is my question. I'm looking for recommendations for a phono stage to replace the PH-7. I don't want to shell out the money for the ARC Reference which is around $10k plus. I think I can get just as good a sound for somewhat less. So as much as I LOVE my PH-7 I am ready to part with it at this point to better match the Kleos.  So I thought I would ask. So any suggestions would be helpful. I'm looking for something maybe with variable gain or at least maybe a high and a low setting for future cartridge upgrades. I would like it to be vacuum tube, and of course have a very natural sound. So that should narrow the field. I have  been so happy with what I have that I have not even entertained auditioning anything else until now so Im a little behind the 8 ball on the available models out there other than ARC of course. May have a little brand loyalty there, but I'm willing to give another brand a try to keep things in my price range of 3-$6k.


Thanks in advance


-Keith

barnettk

Showing 3 responses by lewm

lewm
13,517 posts
 
Look, if you just WANT to get a new phono stage, by all means do so.  Don't let me rain on your parade.  But for sure I do not see the need for a SUT here. You used the word "think", as in "I would think that with records especially you are further amplifying more noise...tube noise, friction between the stylus and the record etc. maybe I’m totally wrong here but that’s what I’m thinking."  Are you actually hearing more noise? 38% vs 47% is not much of a difference, but we don't know what it means in terms of voltage or db. However, we do know from those data points that you are having to attenuate the signal from the Kleos in order to achieve the SPLs you are used to, not a sign that you need more gain.  "Friction between the stylus and the record" is not a source of noise unless the LP is dirty.  Otherwise, on a clean LP, the friction produces the skating force and not much else.
lewm
13,517 posts
 
Apart from all else, why do you think you need to load down the Kleos to 50 ohms?  The Kleos is said to have an internal resistance of 5.4 ohms, so technically, it could drive a 50 ohm load, but 100 ohms is fine.  Higher than 100 ohms might even be finer.  At 50 ohms and below, you start losing signal voltage to ground; even at 50 ohms there is a little of that effect.  That's the last thing you want. Plus, high frequencies begin to roll off into the audio range, the lower the ratio between the load resistance and the internal resistance of the cartridge.  I'd advise against going below 100R.

I looked up the specs for the Mac 2600. It has 15 db of gain available at its high level inputs.  Your phono plus linestage gain is 72.5 db (57.5 + 15), more than ample for the Kleos, unless you have a really unusual amplifier that requires much more than 2V input for full output.

lewm
13,517 posts
 
57.5 dB of gain will give you a signal voltage of about .38V from the Kleos. Do you use an active linestage? A linestage with even 10db of additional gain would do the trick if the input sensitivity of your amplifier is typical. So you don’t need a new phono or a SUT or a prepreamp.
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