Like Helomech said look also at NOS tubes.
I have tried the Psvane 12AX7LS in a Audio Note tube AMP. Amazing detail , hugh soundstage (larger them live b.t.w.).
But the image was flat as a pancake. No depth it blows in your fase. For me that is very boring. Tried many of the new 12 serie tubes (lost money on the experiment) but at the end I ended up with NOS Philips.
You dont need to spend the extra money on rare tubes. I did because of the expiriiment and fun and I like to do resaerch myself.
This time the investment is more solid. NOS tube value can grow over time. I have more hours of tube life than I have probably left myself. I also have to keep the Audio Note or stay with an 12AX an EL84 Amps to burn them all. Not that smart ;-)
As we all know every brand or with tubes. sometime even the same brand by year or production facility sound different.
I like midrange, depth , information and microdetails with real sounding timbre. In General and for me in this Amp with EL84 NOS telefunken as drives the Philips line has in that aspect the best price / value match.
I will not sum up all the tubes I have or have tried. I will never know them all and I am fine with that.
I is just a lead and encouragement to look at NOS tubes. My experiment showes that the Philips line is sound and price wise value for money.