HAVING PROBLEMS FINDING 89T NEEDLES. I can modify your M-75A and M-75B to take the newer cartridge See the picture below. I may be able to do the AC-300 family also, but haven't yet. Call me with your model and serial number.
I am Dick Bull, Head technician at Hilton Audio for over 25 Years, starting before Jim retired.
I will continue to provide "Hilton quality" repair service from my home.
I will be on vacation The end of July first part of August 2019. Call before shipping