Stereo system vs Steinway

Hey folks,

So having more room in the new place, my inherited Steinway grand piano is scheduled to arrive soon.
As an aspiring classical piano student, listening to pieces I am working on is a constant.  

I am told that the piano needs an environment where the humidity stays safely above 45 - 50% to prevent the cabinet from drying out/developing cracks/etc. 

My piano teacher keeps hers at just over 60%.

I have a "secondary" system in the "piano room" consisting of a pair of Ampzilla 2000 2nd editions, with an old Bryston BP26 and a much older set of B&W Matrix 801 S2s.  Source is currently a laptop.

Are there any guidelines regarding safe humidity levels for audio equipment? 
Would 50% ish be too high?

I also just inherited (along with what I believe to be one of the first Rega turntables my uncle purchased in the UK over 30 years ago sitting on an air bladder supported platform) an older and really heavy Jolida tube integrated.  Are tubes more/less sensitive to humidity?

Am I just being paranoid?
Or do I need to consider moving the system out of the piano room and perhaps listen with headphones?

Thanks everyone!