NOS Tung Sol 6550 VS Tung Sol 6550 New Production

Has anyone had experience with the new Tung Sol 6550 new production power tube. If so how does it compare with the NOS Tung Sol 6550 ones. I want to replace my stock Sovtek 6550 in my ARC Ref 6 . But from what im seeing the NOS Tung Sol 6550 is way up in price of about $ 350. And the new Tung Sol 6550 new production power tube is about $ 35 from the Tube Depot. 
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@tattoedtrackman- Just my take on what Schubert meant: The only current production output tubes, that can compete with the old Sylvanias, GEs, Mullards, Tung-Sols, Genelex, etc, are the EAT KT88s. Once having listened to those old tubes, they spoil some of us for anything else. Of course, everything’s VERY subjective, regarding sound quality, aural acuity, pickiness and how much one’s willing to spend. If my money wasn’t funny, I’d still be using NOS GE 6550As. Alas: eight of them, or anything else in their class, have now exceeded my willingness to spend. I’m listening to an octet of the Russian version of the Genelex KT88s, in my Carys. If I ever win a Lotto, NOS Tung-Sols will be on my agenda.
I think that the 6550 the OP is referring to is used in the power supply of his preamp.  I don't think it would have the same impact that a set of NOS power tubes in an amp would.  If I'm wrong, let me know.
I also have the ARC Ref 6 and thought I would try the NOS Tung-Sol.  I like a rich, sweet midrange, which is what the stock Sovtek has.  I did not like the Tung-Sol.  It has more extended highs, a deeper, tighter bass and is more dynamic.  However, the midrange is sacrificed for these qualities--all in all I did not find it musical.  I much preferred to original Sovtek; it has a very sweet, rich midrange.  I thought there might be an issue with break-in time, so I did put 50 hours on the Tung-Sol with only a slight improvement.