For Sale: Grado Reference Sonata cartridge. The Grado cartridges are a Moving Iron design. The Reference series is high output (MM setting) at 4.8mV. This cartridge is virtually new with less than 50 hours on it -- perhaps as few as 20. Shortly after purchase, I came across a demo Reference Master and so made the upgrade. Cartridge comes with original wood case and white outer box, copy of owner's "manual", and mounting screws (not pictured but of course included). Please ask if you have any questions. Free shipping in continental U.S.