Changes to Orchestra tuning.

My guess is that it is specific to that hall, based on someone having ’new’ measurements made, as I say, just a guess, but I can imagine the process of getting an institution to change a fundamental, there must be a convincing argument for the change, not so convincing for the status quo

There is a chart showing the history of musical pitch here

music theory online : pitch, temperament & timbre

and there is this

history of piano tuning

Is this classical music's version of the "loudness wars?"

@bolong 

no, this is a real issue, that effects music at it (re)creation.This Loudness Wars is a mixing issue 

I was being facetious. However, increasing the string sections "brilliance" with the higher tuning might be considered an increase in "loudness."

@frogman. Very interesting re the oboe for tuning. I've often had season's subscriptions to Symphonies since the 70's.  Hundreds of concerts. Just goes to show my inattention :)  I've never paid attention until I've heard the 1st violin fire up. I'm always reading up or discussing the program. Perhaps the tones of the notes? Interesting to learn after all these years. Next visit I'll be paying attention! I hope. Thanks for your gentle information  :)   I guess the Oboe players will be working on their reeds :)