Mike Sanders of Quicksilver fame makes an excellent SUT! I have one for use with my 103R.

Hashimoto HM-3 SUT by Sound Tradition 

I actually have the AnaMighty SUT. Pretty much the same as the A23. I've yet to hear much of a difference... that's why I'm looking to go a step higher.

I have a Homage T2 for my Charisma Denon 103 and EMT tsd carts. I also have a copper version of the Emia Slagle step up for my low impedance My Sonic lab cartridge. Dave is excellent to work with, and offered me top notch service. Performance wise, it's a sleeper, and well worth seeking out. I can't recall the review, but it was a recent Herb Reichert one. He said his copper wound Slagle was better than the Bob's Sky, which many feel is an excellent value. The Slagle is around $2700, so closer in price to your standard A23 than the Homage. Needless to say, just a satisfied customer. No kickbacks (-: 

Dear @dhcod  :  " Pretty much the same as the A23. I've yet to hear much of a difference... that's why I'm looking to go a step higher. "

Well, I think that could be useless to look for any other SUT because we have to remember that the SUT is connected to a phono stage and IC cables and receives the recording signal after that signal pass through other stages ( in the phono preamp ) where the more critical is the RIAA eq. stage and where the Leben is a true " disaster ". So if you really want to go " a step higher " then you need a better phono stage along the SUT you already own or chage the phono stage unit for one phono stage with active high gain and no SUT.

Take a look how the Leben performs in the RIAA eq and the other issue is its high output impedance:

https://www.stereophile.com/content/leben-rs-30eq-phono-preamplifier-measurements

You can't ask for oranges to that banana tree. No way ! !

Lamm does not helps to much. You need a more solid phono alternative.

R.