Calling all tube heads


I am retubeing my arc ls-16 , and have found some nos amperex tubes, and need to know what will work best in it , an a frame, or a round getter halo ? any clue to what the differance between the two are?
yeti
What tube type, 6922?
Are the Amperex you plan on putting in USA, Dutch or other?
What sound are you looking for?
What tubes previously ran in the ARC and what did you like and dislike?
I have 6922 sovtek's in there now , and am interested in 6dj8's made in holland orange globes
I had amperex 6922 (PQ) gold pins in my LS-25 and had nothing but trouble, I called Audio Research and Leonard told me they didn't use Amperex tubes . So that was good enough for me, I just bought a set from Audio Research and now I have no trouble. I can just listen to the music.