Dealer feedback ... However if to the contrary , sure would pine for one . At this point in time am thinking of trying the Big7 , just be waiting that little bit longer for the aluminium chassis and maybe for tube rolling to be added to the balanced version .
NA dealers have not heard the GG yet, so you may be talking about Asia? NA guys will hear it in Axpona they tell me. All this info is at A-Circle forum.
You CAN roll tubes in the Bal. ... Just brands though as it will be 101d based (PSvane Treasure, WE Replica and real vintage WE (Globe and ST --which I have)...plus some French equivalent tube. Also even for the WE, there is the Bakelite base and the metal base.
No chance of rolling output tube TYPES, eg 45/6A3/300b, etc...
You CAN also roll the Rectifier. 5u4g,5y3,5R4,54R, GZ34, GZ37, 422a, U52, type 83v, type 80, (last 2 with adapter). Basically any 5v recti will do, but they vary dramatically due to IH vs DH and VOLTAGE DROP.
Copper chassis in the GG makes for a better shield than Alu.
If you have a fully balanced setup, then the Bal GG or B7 is the way to go for sure. Otherwise SE is better.
I am hearing about a Bal B7 HeadDac as well for the near future. I am also hearing that R&D will be shut down for the next year or so, as he has finalized enough killer products lately and need to work on prod capacity at the moment.