Tube rolling Question

Some good info can be found here: http://www.dehavillandhifi.com/6sn7_vt.htm Having tried the top twelve on that list, I’ve been using the Tung-Sol, Round Plates and Sylvania 6SN7W, metal base tubes for years, with no desire to move. SO GLAD I bought a few, before the prices went nuts! Some, that provide almost all the nice attributes as those, but- don’t sell for nearly as much, are the 1940’s, bottom-gettered, Ken-Rad(JAN-CKR) and bottom-gettered, Sylvania(JAN-CHS), VT-231/6SN7GT tubes. The balance of those twelve(that I tried), were all too warm/colored(for my taste, anyway). Here’s a very reliable source: http://www.audiotubes.com/6sn7.htm

I'm using the Tung-Sol Round Plates, 1940s and they are wonderful. But at $275 per tube for low noise low microphonic, it's a major expense.

I used the 40s Tung Sol rectifier tube with my Sylvania 6SN7 Bad Boys in the Woo Audio headphone amp with great success. I bought a matched pair of Tung Sols at no small expense just in case. Better safe than sorry. I also used two Herbies Tube Dampers per Tube, one on the glass the other on the base. Again, better safe than sorry. 

I consider spares indispensable.  I just hope my spares stash outlasts me.  I'd hate to have to miss a mortgage payment(proper priorities, and all).

Be very careful of any seller that sells "NOS in white boxes". What this usually means is that the tube tests as NOS but is most likely used. I am not sure if one respondent was suggesting that there exist 6SN7s that were made by Amperex but just for the record Amperex never made a 6SN7. I have seen Amperex branded 6SN7s but these were made by GE. Be very careful of tubes branded Sylvania Bad Boys. The Bad Boy is a great tube but is very specific in construction. Tall, 3 hole black "T" plates with bottom foil getters. Most I have seen were made in late 1951 and in 1962. This is the only Bad Boy made and many ebay sellers are selling Sylvania tubes as Bad boys which are not and quoting an online tube seller who knows (or should) better. Be careful.