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Museum of the Game® & International Arcade Museum® Forums
Not sure if anyone has used them before but I am impressed with their work. If you are still using the 8 track player in your em games like I am, they may be able to make you a tape. See the pic for their contact.
I was working on fixing Gangbusters and the tape was a little worse for wear. It still works but i wanted a backup. I found them online and bought 2 copies of Gangbusters as it was one they had a master of.