tube rolling


Here's my question? I'm wanting to change tubes in my phono preamp(ARC PH-3SE) Currently running 6h23n Russian tubes.
Looking to switch to either tesla E88cc/6922 saber logo or tungram E88cc(Hungarian) tubes.
Has anyone had experience with either tube? Would either be an upgrade from my current tubes?
eee3
Newbee, Have you heard of a company called Tubemonger?
I ran across their information while googling and was wondering how reputable they are?

Thanks again for youe responses.
I've no personal experience them, but I do recall their reputation being discussed in the tubes forum on AudioAsylum. Can't recall if it was good or bad. You might visit the site and do a search under that name (ditto here).
You might try Vintage Tube Services Andy is a great guy and knows more about tubes than anyone I have had dealings with. He is a little slow but he has the nicest tubes around.
Jsman, what is the website address for vintage tube srevices
I typed in the way you have it written but it came up error.
I also typed in Andy's Vintage Tube Services and it still came up error/ site does not exist.
Tubemonger is a very reputable dealer and is also generous with his time in helping out less knowledgeable folks on audio forums. He does not try to sell his tubes on forums, he shares his knowledge of tubes.