I also recommend Brent Jesse
https://www.audiotubes.com/audtube.htm
just scroll down to the 5ar4 section
I would let him know I was going to buy two pairs of 5ar4’s
1 pair psvane’s at $49.99 and one more expensive pair (you pick or he recommends for your equipment?), simply return one pair after comparing them.
break them in for 60 hours (no signal needed, just leave them on), then compare, pick.
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now, Brent does not have many low cost in stock, perhaps Tube Depot this time, tell them same thing, ordering 2 pair, will keep only 1
https://www.tubedepot.com/products
My experience, I hated the sound of the expensive ones, loved the sound of the inexpensive ones as much as my Cayin OEM tubes