Staying under 300 may be a tough call. If you look at the vintage step ups from 1970s through 1980s they seem to start around 450 and up. You may want to consider a ned clayton base and buy either cinemag transformers or the OJAS transformers which will work well. The combined total will push you over your 300 dollar price point by 150 to 200 bucks.
SUT for AT-OC9XSL?
Finally looking to get a proper SUT for my AT-OC9XSL cartridge. Does anyone have any experience with a good SUT for this cart? Internal impedance is 12 ohms I believe… haven’t seen many SUTs that mate well with anything but 3-5ohm carts. Any recommendations???? Trying to stay under $300 if I can.