Legal type question here.

I belong to a fire company and we have a lot of he said/ she said issues. We purchased a recorder for our meetings last year when I was secretary. I used it faithfully, transcribing the meetings at my leisure afterward.
Since someone else took over as secretary ( this person is best buds with the Chairman of the Board) the recorder has not been in use. In my mind, this means that the minutes of the meetings will be biased, with the secretary including only what she wants, or what she is told to include.
I made my own recording of the last meeting. Glad I did, because things got a little hairy and someone got ejected for simply disagreeing with the asst chief, and my recording is the only thing that proves his side of the story.
My question is this: Since recording the meeting was customary, did I do something illegal by making my own recording? It wasn’t until after the meeting that I discovered recordings were no longer part of the official minutes process.
Thanks for any advice.
P.S. This is in Pennsylvania.