Getting The Most Out Of A Koetsu Urushi

Raul, who is known for the MM thread here, owns an 801 and really likes it.  Perhaps he would be able to help with the specs.  But there is also no harm in just listening to the combination of 801 and Urushi. It's quite likely to be just fine.  Since the resonant frequency is inversely proportional to the square root of the product of effective mass X compliance, there is quite a bit of leeway in terms of what tonearms work with what cartridges to satisfy the equation.

Nandric,  It's worse than you say.  My MP1 was "tweaked" by me and now has more than 70db gain in the phono section alone.  And it's very quiet.  I historically used the Urushi with the MP1, but it was an earlier version of the MP1, still with its factory original circuit which made less gain, but still more than adequate gain for the Urushi.  So, running the Urushi into the hi-gain MP1 might be somewhat problematic. I haven't tried it lately.  I also own a Manley Steelhead, which feeds into my Beveridge speaker system.  I use it as a "full function" preamplifier, with no external linestage. I run my MM/MI cartridges into the MM inputs of the Steelhead and thence into the Beveridge amplifiers. The Steelhead can be well matched to the Urushi via its MC inputs. Right now, the Urushi is in its nice wooden box, at rest.  The ZYX Universe or the Ortofon MC2000 feeds the MP1.  Even with those cartridges, the volume control of the MP1 is barely up to 9 o'clock, where 6 o'clock is "off".  I use a stereo shunt type volume control on the MP1 which does not seem to affect the sonics, even when near to the rest stop.  

This manufacture utilizes a very low output (mV) design strategy. What is your current loading and gain setting on your phono stage?

The loading is for the benefit of unstable preamps and does not affect the cartridge. If the phono stage is stable, 47K will be fine.

I would suggest you get in touch with Bob@bobsdevices.com.  He can tell you the right answer.  Even though you might have enough gain and loading, he'll tell you the optimum.

Stringreen, Bob is a very reputable guy by all accounts I have read, I agree.  But he does SELL step-up transformers.  He would have to be a saint in order to provide a truly unbiased opinion.  Anyway, the point is that the "right" answer is there is no need for a SUT in conjunction with the Liberty phono stage/Urushi combination owned by the OP.  That is incontrovertible.  If you think there is an inherent electronic benefit to using a SUT in every case where one is using an LOMC cartridge, then that is an interesting and separate argument.  I am sure Bob knows how to make that argument.

Dertonarm who proved his capabilities with his products was/is
an advocate for SUT's in combo with LOMC's. But his theory was
that both , the cart and the SUT needed to correspond qua inductance and impedance. He advised me accordingly but I  was frightened with perspective of many SUT's needed for my LOMC's collection. I changed my mind when I discovered Denon AU-S1 which covers 2-40 Ohms carts. I use Denon with my Klyne         7PX3.5 in MM (amplification) stage.