When I rebuilt my MKIII's I used a technique one of my old Professors taught.

Design and build to last forever. Use the best parts you can get.

The bias pots are sealed Mil spec. The resisters are Vishay and Holco. The caps are Solen and Wondercaps. All the point to point wiring is Teflon coated Silver. WBT and Cardas are used for input ouput connectors and the ceramic tube sockets have Gold plated pins..

The Tung Sols seem to be broken in. The sound is very slightly forward with a sweet top end.

Maybe I'll try some rolling with the 6922's and see what happens.