SUT suggestions for Audio Note System

Update

So I hooked up a MM high output Grace F9 up to the M6 phono. It was far too loud. Even 1 on the dial was too loud for late night listening and four was a very uncomfortable level. Dover suggested that I hook my Koetsu black MC straight into the MM phono. So I did that and the volume is perfect. One or two on the dial for late night listing 3-4 nice comfortable daytime listing and 5 if I want to push it. So the question is did I just saved myself $5K on a SUT or am I missing something by not using an SUT. It is evident that I could undoubtedly use a low level SUT which means I could find a used Audio Note as they are usually available..

@pkvintage 

That's great info.

The Audionote SUT's are very high gain - designed for their very low output cartridges. Based on your results any SUT is probably going to result in too much gain. The AN ones will be unusable with the Koetsu.

Bottom line is - how does it sound. Are you happy. If so sit back and enjoy the system. I know a lot of people running Koetsus straight into tube MM phonos at 47k with excellent results provided there is enough gain.

Interesting options for you down the road could be cartridges around 1mv output such as the Grado Signatures, or EMT mc range which are around 1mv output.

Spend your money on records.

I spoke with Audio Note and they told me that it would be fine to run the system this way but I am leaving sound quality on the table by not matching the impedance of the Koetsu. The reason I am able to run it this way is because of the amount of gain I have in the system. The amps are 18 W, the M6 has a lot of gain, and my speakers are 98DB. The solution is to modify the amplifiers to the low gain version which is not difficult or costly. I then have to get a medium output SUT in the 15 to 20 ohm range. And here I thought I could save some money. LOL.