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Thought I would share some thoughts on my experiences with SUTs. Despite having had phono stages that support both MM and MC, I have ended up preferring the sound of my MC carts via SUT into the MM setting. I usually find that a well matched SUT brings an extra level of refinement and removal of grain compared to using the MC settings. They also reduce the background noise compared to using active gain. However it can sometimes prove a difficult exercise finding a good match between SUT and cart. I have found that a badly matched SUT can destroy the dynamics of an MC cart. It also doesn't help that I find the theory and calculations somewhat bewildering, so usually default to manufacturer recommendations where available. Also hard bitten experience and word of mouth recommendations are most valuable. A fellow wammer once suggested the absurdly cheap HFN Black Head SUT for the AT OC-9 as this was a combo he found worked well many years ago. And after a quick trawl and low cost purchase on ebay, so it proved, the Black Head bringing a creamy but expressive smoothness to the top end of the OC-9 ML2. But in the main, my best results have come from using a SUT designed for the cart. For example, the Auditorium A23 brought the best out of a Denon 103. Similarly I have also found that the inexpensive Audio Technica 630/650 from the 1980s work well with the AT33PTG2, a cart not dissimilar to the AT32E and AT33E that were the natural partners of these two SUTs when new. I once owned a nice Shelter cart which I was never able to get good results from. Only once I heard it with a high quality multi-adjustable S&B SUT did I realise how good a cart it was. However I also had to accept that I would not be able to afford the required SUT so I ended up selling the cart. But despite the potential pitfalls, I have never had to spend a lot to get a good result as there are some good used bargains to be had. And of course being an entirely passive device SUTs dont break down so present a low risk used purchase, that can always be sold on at little or no loss. So if you are tempted, I would say give it a go. But do your research first on the specifications needed for your cart, or alternatively (like me) just seek help from a more knowledgable wammer!