6SN7GT VT231 TUBES

@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.

I have 3 pairs of Melz but no more interest in them due to noise problem.

I also collected more than 8 ohter Russian tubes whish also sound decent.

I just put a 6F8G in my amp and I think I like it better.  Seems to have tightened up the bass.

RCA black glass.

Brent Jessee, great source of information, huge selection, good guy to deal with.....he doesn't give his stuff away, but he has the inventory

I know this is not really what you're asking but I have a VTA SP-14 and just replaced the 4 6sn7's with 7n7's (you'll need a base adapter, readily available on ebay). A much more open and detailed sound with no etching of the treble. The bass seems a tiny bit looser but still powerful and tuneful. Very impressed!