I promise I will try EL39 EL12spe and GU50 ... and many small tube in input..
This will not be done with artistic photo but will try to picture it anyway. I will also try to get better output measurement with my old e-mu tracker pre if i'm able to use it with windows 10
But i will enjoy a bunch of track i've selected to try Eternity my headphones and different set of tubes.
I think you will like EL39. I liked a lot EL32 and EL38, those are good but not for my musical tastes, where EL34 or KT77 are better. About GU50 I have no idea, that is the one I am mostly interested to read.
PS. My photos are made with a simple android phone, then just maybe a filter. That's it, nothing fancy.