Here's an empty moving coil phono step up box for use with your DuKane input transformers. This box will work with any of the 3A transformers listed in the title, and possibly others, though the ones listed are the ones it's been tested with. This is a fully wired box and all you need to do is plug in the transformers and hook up it up between your turntable and MM phono input.

This box has gain switches to use the full primary (lo) or the center tap (hi). The ground switch in the middle selects how the aluminum enclosure is grounded for shielding. In the middle position the enclosure is completely separated from the audio grounds, which are also both kept separate from each other. In this position you'll have to run a separate wire from the SUT ground screw to your phono preamp ground screw. For convenience you can also select "L" to ground the box to the left channel audio ground or "L+R" to connect the two audio grounds and the box all together. Connecting the box to one or both audio grounds is the easiest way to ground the enclosure and it generally doesn't cause any kind of problem to do that, but the middle position is there in case you want to keep the ground scheme coming out of your turntable, with the two audio and the chassis grounds all kept separate up to your preamplifier. In general you don't have to worry too much about what the switch is doing, just hook up the box however you like, and put the ground switch in whichever position gives you the lowest noise.

The box you receive will be new, and guaranteed to work providing your transformers work. If you have any questions about your transformers or cartridge, please feel free to ask. I'm happy to help if I can. Thanks for looking!