Back in the day, Sony was a leading in turntable technology. That included Sony's line of moving coil phono cartridges like the world famous XL88D. Sony introduced various affordable moving coil cartridges, but since most amps and receivers did not have a moving coil input, they introduced the HA-T10 mini moving coil step up transformer. Key to Sony's technology was micro manufacturing. This is a precision moving coil step up transformer with true audiophile sound quality. It uses a U-shaped core for high efficiency and twin bobbins to reduce interference and noise from external magnetic fields. It is ultra small and you plug the RCA cables from your turnable into it, and then plug these into the normal magnetic phono input. They work wonderfully and sound glorious. If you know about the sonic advantages of moving coil cartridges, but lack the needed funds for a high quality step up transformer or moving coil preamp, please consider the HA-T10. It is a lot better sound than you might ever imagine for its size or price. If you don't love it, return it. NEW IN BOX, NEW PRODUCT!