Best SUT For Van Den Hul Crimson Stradivarius cartridge

Kanchi, I am trying to figure out what you're getting from what you already own.  According to the Ypsilon website, "MC26L" sounds like the designation for one of their SUTs.  And VPS100 denotes their phono stage.  Since Ypsilon seems to use the db gain factor in naming their SUTs, I assume your SUT provides 26db of gain.  (I hate that they use the term "amplification factor", by the way.  It adds nothing, because what one needs to know is the turns ratio which indicates the voltage gain.)  26db of gain converts to voltage gain of about 20X, which means that the output of your 0.95mV cartridge would be seen by the inputs of the VPS100 as ~20mV.  I can well imagine that this much voltage (and much higher signal voltages in actual practice) might overdrive the phono stage and cause the distortion I guess you are hearing.  On the other hand, the VPS100 by itself provides 39db of gain or about an 89X voltage gain.  This begs the question: are you using an active linestage downstream from the Ypsilon phono stage?  If you do have an active linestage, take note of its intrinsic gain.  If it is at least 10-12 db, you may have enough total gain just in the YPS100 plus the active linestage to drive your amplifier to adequate output.  This depends also upon the input sensitivity of your amplifiers and on the efficiency of the speakers. In other words, you may not need any SUT.

@lewm the VPS 100 -> CARY SLP 05 -> CARY CAD 211 FE -> KEF Blade speakers.
I did connect the cartridge directly into VPS 100, but had to increae the volume to 100% to get enough sound level.
Which is why I am looking for a SUT.

@elliottbnewcombjr 
what is the difference between Impedance selector and load selector?

https://www.ebay.com/itm/KONDO-AUDIO-NOTE-AN-S7P-MC-STEP-UP-TRANSFORMER-JAPAN/123923446228?hash=item...
Thanks

Kanchi, Your linestage adds 17db of gain, according to the Cary website.  So, with the Ypsi and the Cary linestage you have a total of 56db (39db + 17db) of gain, which is a voltage step-up of about 630X.  Thus when the cartridge is putting out 0.95mV, the SLP linestage is putting out about 0.630V.  Bear in mind also that the rating of 0.95mV is for the frequency of 1kHz and the stylus velocity of 5cm/sec.  A large fraction of "music" will produce transiently higher output V. For many amplifiers, that would be sufficient to drive them to a decent fraction of full output, at least.  However, your Cary 211 amplifiers require 2.0V for full output, according to Cary. Therein lies your problem.  The 211 is a difficult tube to drive.  In lieu of buying a SUT, you could instead replace your linestage with one that produces more gain.  It's not hard to find excellent linestages that are in the 20db to 25db range for gain.  That would eliminate a whole slew of problems with matching a SUT.  And based on the typical cost of high end SUTs, the cost differential is not that great.  With a megabuck phono stage like the Ypsi, you don't want to match it with a bargain SUT. You stand the risk of losing the qualities you've paid for.

To answer your question put to Elliot, with any SUT, what you want to know is the turns ratio.  Knowing the turns ratio or voltage gain afforded by the SUT, you can easily calculate the load seen by the cartridge, if you know the value of the fixed load resistance built into the phono stage (typically 47K ohms, which is what Ypsi uses).  If you can find a SUT with a 1:5 turns ratio or a 5X voltage gain (there are calculators on line if it makes you feel better to convert voltage gain to db), the load R seen by the cartridge is 47K ohms divided by the square of the turns ratio.  Thus for 1:5, the quantity is 47K/25 = 1880 ohms.  For a 1:10 SUT, much easier to find, you have 47K/100 = 470 ohms.  Both loads should be easy for the vdH to drive.  If you don't like the idea of replacing your linestage, I would suggest you borrow a SUT with a 1:10 ratio and see how it goes. 1:10 might be fine.

It's something like EMT output
So stepups used for EMT should work well. Like this one:
https://www.emt-tontechnik.ch/files/productfile/Flyer-STX.pdf