The Philadelphia Orchestra , known in recent years as much for the fiscal woes that drove it into bankruptcy in 2011 as for its vibrant performances, announced Thursday that it had received a major ship-righting gift of $55 million.

The donation, which the ensemble said had been made by “individuals who have chosen to remain anonymous,” will help it recover from a difficult period — and allow it to capitalize on its artistic success under its music director, Yannick Nézet-Séguin, who also took on the same role at the Metropolitan Opera this season.

“This enables us to author the orchestra’s next chapter with greater confidence and with greater ambitions,” Matías Tarnopolsky, who became the orchestra’s president and chief executive officer in August, said in a telephone interview.

It is a rare bright spot at a gloomy fiscal moment for many orchestras. Just last week, the Baltimore Symphony Orchestra abruptly canceled its summer season as its management tries to cut the number of weeks it employs its musicians. Earlier this year, the players of the storied Chicago Symphony Orchestra went on strike for 47 days, eventually accepting pension changes they were resisting. In the fall, Lyric Opera of Chicago’s orchestra struck briefly before accepting a contract that guaranteed fewer weeks of work.