Understood.
I can't find any feedback on the 2A3T, so I'm in the same boat as far as making rec's.
I assume that many/most are also looking for reliability, along with sound quality, which makes recommending new production tubes somewhat difficult.
This said, I would suggest a nice new testing pair of RCA Black or Gray bi-plates as a baseline reference and as backups for whatever you find you like better through trial and error.
They should be available in the $200-$300 range and they last forever/sound good in my amps.
I use RCA Back/Gray Bi-P's, Ken-Rad Black glass dual flat plates and early Vissesux engraved base Bi-P's.
I suspect that later screened base Visseaux's may have also been marketed as Mazda (or visa versa), but I have not used either in my setup.
Just throwing that out there in the event that you eventually look into Visseaux.
DeKay