Empire Magnetic Phono Cartridges 1976 Ad. We make a complete line of phono cartridges. Each one has slightly different performance characteristics which allow you to choose the cartridge most compatible to your turntable. Unlike other magnetic cartridges, Empire's moving iron design allows the diamond stylus to float free of its magnets and coils, imposing much less weight on your record's surface and insuring longer record life. Electronics. Stock Number: 10350.