The musicians of the Pittsburgh Symphony got an astonishingly mammoth raise this season, the result of a backloaded contract negotiated by a management team that his since left the building. And now, with a financial crunch on the horizon, the PSO’s current managers are hoping the musicians will be willing to take their raise back a notch. A proposed new three-year deal, which would replace the current contract, would shave $6,000 off the minimum salary, but restore the higher wage beginning in fall 2006, and preserve it through the 2007-08 season. The musicians will vote on the revised deal tomorrow.