which 6sn7 gives the most air??

The bottom-gettered VT-231 Sylvanias(JAN-CHS) and Ken-Rads(JAN-CKR), from the Forties are wonderfully clean and airy, and present a wide sound stage(if the rest of the system supports). No artificial warmth, though some are fond of that. Not too pricey, either! If your amps take two 6SN7s each, mix them to get the strengths of both brands. ie: https://www.ebay.com/bhp/sylvania-6sn7gt and https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313.TR2.TRC1.A0.H0.Xken-rad++v... This may be of interest: http://www.dehavillandhifi.com/6sn7_vt.htm I’ve tried the top fifteen tubes/brands, on that list. To me, all sounded to warm/colored, but the Sylvanias, Ken-Rads and Tung-Sols. I’m currently using a pair of 6SN7W(tall bottle/metal base) Sylvanias and a pair of Tung-Sol VT-231, round plates. Glad I bought a few pair, before the prices on NOS tubes went nuts.

I've used that Dehavilland/Chimera list as a guide and found the results spot on, although not complete. The VT-231 Tung-Sol, round black plates have it all, air, dynamics, 3D image, and a premium price. 
As stated above, Sylvanias are neutral with airy highs. These are the go to tubes for clear top-end extension. All the RCA's have a classic warm presentation with open sonics and excellent soundstaging. Amperex Bugle Boys have airy highs with amazing 3D imaging. 
There are so many good tubes on that list, try to buy from a dealer who accepts returns or exchanges.
A good source of tube info and a very good dealer is Brent Jessee.
http://www.audiotubes.com/6sn7.htm

Here's a link to Brent Jesse's 6sn7 website page - might be helpful to you. I am not affiliated with Brent other than as a customer

bopper,
Go to head-fi.org and read The Reference 6sn7 Thread. They list all the 6sn7 tubes and pretty accurately describe how they sound.

I have collected just about all the best 6sn7 over the years.
Top end air, Tung-sol round plates or Sylvania 6sn7w tubes.
The Ken-rad VT-231 staggered plates have great bass and have more of an airy midrange than treble.

The Sylvania 52'GT(bad boys) are beautiful sounding tubes and probably my favorites. I know everybody loves the Tung-sol, but IMS the bad boys just sound perfect.

The Brimar CV1988 6sn7GTY are really nice too.

  

thks will look at those- what are the pope tubes- Saw a quad set for sale and seems like a great tube but big bucks - what makes them so special-