A full rebuild of the upper air amplifier was completed.  New anodized aluminum barrels were installed (replacing the old brass design), as well as new pilot valves, piston seals, bearings, and o-rings.  

The amplifier is operating smoothly with a cycle period of 25.6 seconds, compared to 14.8s before rebuild (based on 8 cycle measurents at 110psi output with beam blockers lowered).  

The lower air amplifier currently has a cycle period of 24.8 seconds under the same conditions (rebuilt in 2010).