I've restored a couple of these for friends. Also owned them new back in the day. When set up properly they can still provide a rewarding musical experience.
George Merrill offered a great mod for the original XA. I cut the arm well out of the subchassis on my XA, and mounted a Formula 4 Unipivot. In the 1980’s Acoustic Research reintroduced the table as the ES-1, which included a separate arm mounting board. I had one with a Rega RB300 mounted on it, a good combo.
bdp, I think the Mayware Formula 4 was a popular replacement for the standard AR arm. Likely because it was also light weight (no impact on the suspension if done properly) and a good performer.
I changed to that arm too with the help of a buddy with access to a machine shop. He was able to modify the T-bar for the Mayware arm and punch a larger hole in the steel top plate. It looked like a factory installation when he finished.
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