I haven't used an SUT for a while but the ones I own are adjustable. Not familiar with the verto, but you may be able to go higher than 24db.
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For about $750 you can buy amazing JLTi phono stage from Australia with high gain and ability to use different load resistors "on the fly". With this stage you can use whatever load you need for any cartridge (any MC or MM). This is the best way to save your money if you don't want to buy too many suts.