which 6sn7 gives the most air??

Is your RCA labled as 6sn7 made in 1950’s?

Then I recommend you to get RCA vt 231 made in 40’s which will give more air and refined sound.

Sylvania vt231 also give lot of air but could sound lean lacking bass.

Tungsol bgrp vt231 also sounds nice as RCA vt 231 but over priced due to hype.

Amperex is a nice tube but not with good air.

Kenrad sounds bass heavy not much air.

I favor 6f8g tubes not for air but for fuller sound.

By the way I had collected more than 100 different kinds of 6sn7 and variants for fun not for business.

I do not sell tubes.

Thomas

If your system sounds bass heavy, it is advisable to try Sylvania vt231.

Tube rolling could be fun to tune your system.

The only bad part is that some hyped tubes get over priced.

Thomas