Braro - "grain" is normally something associated only with solid-state designs. Grainy is considered an escalated form of dryness. For example, Bryston gear is dry but Supratek is not. It is quite possible to get some glare with the stock tubes though.
http://stereophile.com/reference/50/index3.html
But anyway, I would highly recommend that you roll the 6sn7's. Amandarae, Ecclectique, Bwhite and too many others have made excellent recommendations on 6sn7's. You should search their notes.
http://stereophile.com/reference/50/index3.html
But anyway, I would highly recommend that you roll the 6sn7's. Amandarae, Ecclectique, Bwhite and too many others have made excellent recommendations on 6sn7's. You should search their notes.