I was asked to restore some AR-3a's. Turns out they still belong to the original owner who bought them from Sound Reproduction in East Orange NJ back in 1969 or 70. That's where I bought my 4x's at about the same time! So my first thought is to adhere to the speaker doctor's oath of "first, do no harm." The cabinets and grilles are perfect! I'll clean the wood and oil them but nothing more is needed. The linen, although undamaged, shows its age so I'll install new linen from 123 Stitch.