l had many amps and pres that used the 6sn7, so I had alot of experience with them. Were the 6sn7w USN the tall metal base '40s version? In my experience they were superb! To match those is extraordinary. My favorite was the legendary Tungsol VT-231 Round Plates Oval Micas. These and the Sly Metal bases are very expensive now.
How would you adapt the 7963 for the Lyr? Build adapters?
I have tall-bottle metal base and short-bottle black base 6SN7W's. In my opinion, the metal-base version has more bass slam whereas the short-bottle has better base detail. I also have several TS VT 231 Black Glass Round Plates, both round and oval micas. Of these, I prefer the short-bottle 6SN7W.
The easiest way is to use two 9-pin socket savers and some 18-gauge solid core wire. Cut 8 pieces of wire, about 1" long, and strip one-half. Insert the 7963's thin wire leads into the appropriate pin holes in the saver and use the pieces of 18-gauge wire as "push-in pins" to secure the leads. No soldering is required. :)
Pictures are worth a thousand words, so a look at Mordy's posting in the Little Dot forum shows just how easy it is. He is rolling a Raytheon 6832, but the pinout is the same as the 7963:
The rockgrotto site has a nice graphic showing the different pinout diagrams for the 6DJ8 and 7963. One has to remember that these pinout diagrams are drawn as if you are looking down on an upside down tube. Looking at the top of a 9-pin socket saver is the mirror image. So looking at the 7963 upside down, the pins/wire leads are numbered 1 - 8 in a clockwise fashion. Looking at your socket saver, for a 6DJ8, the pinholes are numbered 1 - 9 in a counter-clockwise fashion. The 7963 does not use pin 9, so you can simply leave it empty.
Edit: My avatar is a tall-bottle metal base Sylvania 6SN7W. The metal base split and I am using a "high-tech" twist tie to keep it in place. lol :)
Edited by gibosi - 5/20/14 at 7:17pm