I finished my GSG this weekend, pretty much as per the parts list accept auricaps and transendar opt.
Tubes are nos GE for the 6SL7 and 6AX5, Sylvania 6B4G
I have to say thanks to Shannon for such a great design, it really shines.
With only a few hours on it, it is sounding pretty good for tonality and speed, the sound stage is growing, bass is quite impressive.
Ed