The Aria basic WV11 is still $6350.
Not anyone can afford it.
Since the thread starter is interested in 6SN7
I could only recommend Melody 1688 Signature
or TubeCAD.com DIY boards for the Aikido 6Sn7 balanaced design) , or get Scott Frankland (local in the Bay Area) to custom build an MFA line stage for you.
The Ming Da 2A3 seems like its not purely a 6SN7 preamp.
The 6922 seem to be used as followers.
Not anyone can afford it.
Since the thread starter is interested in 6SN7
I could only recommend Melody 1688 Signature
or TubeCAD.com DIY boards for the Aikido 6Sn7 balanaced design) , or get Scott Frankland (local in the Bay Area) to custom build an MFA line stage for you.
The Ming Da 2A3 seems like its not purely a 6SN7 preamp.
The 6922 seem to be used as followers.