[fado]

I looked at a phono preamp and the description said that it had built in SUTs. What are SUTs? Most relevant online definition seemed to be "system under test" but I don't know if that is what it means for audio components.
Thanks

[JohnR]

Step-up transformer.

e.g. https://www.ortofon.com/hifi/products/transformers

[audio.bill]

A general description of the function of an SUT in a phono stage is to provide the additional gain needed by low output moving coil cartridges when compared to a typical moving magnet cartridge. An SUT can be an external device with a MC cartridge feeding its inputs and its output feeding the input of an MM phono stage, or used internally in an MM/MC phono stage and would then only be wired to the MC input.

[fado]

Thanks, John R

[fado]

... and audio.bill - now I understand.