[Latitude 28]

Would a hyd accumulator do the same thing?

In essence the acoustic ball was a passive accumulator i.e. no pre-charge or check valves....much like the water hammer device attached to the washing machine hoses in your house.  In the case of the two different aircraft manufactures both hyd systems had accumulators perhaps ten feet of line from the pump close to the reservoirs before it reached the first accumulator.  The Lear did not have the acoustic ball close to the pump and where we had issues....the Citation had the acoustic ball modification installed close to the pump with none of the issues, hydraulically, that the Lear had.  This thing was a stainless steel sphere plumbed into the pressure line.....the shape may have been the magic sauce absorbing the impulses.