6SN7GT VT231 TUBES

Interesting that I mainly use the 6SN7 tube family in my preamp and have not experienced any noise or microphony issues with older tubes.  Just a couple outright failures.
My preferred 6F8G tubes are Raytheon with flat ladder plates (very hard to find).  Step up from the T plate version.  National Union round plates and RCA Gray Glass are also excellent.

@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