@shkong78 Are you still on the Melz 1578 bandwagon? I bought two pair from an ebay seller you had cited. My experience with them was dismal as none of them made 50 hours use. I just ditched the last pair a few days ago. Don't get me wrong...I'm not blaming you for my outcome, just wondering if you've had better luck with longevity.
6SN7GT VT231 TUBES
I love the old VT231 tubes!
The best sounding 6SN7GT ever...Sylvania, Raytheon, RCA, Ken Rad Etc. They may still be found, if you have $$$!! Where can I find true NOS VT231s? Any favorites that I missed?
(TS never made a VT231 - but their old black glass tubes with oval micas sound great!)