I sent my Grado Reference (the $1200 one) to Grado for a rebuild after using for 7 years. They sent it back saying it was perfect! I do clean my records using a Nitty Gritty and use Last #4 cleaner. This is not typical for my use as cartridges rarely last more than 1000 hours or a year. Nice to know Grado will check out the cartridges, though.
