Dear 6sn7/6f8g fans, I've received parcel with 6f8g's RCA, National Union, TS RP & FP. What I can say for now - I do prefere most TS RP. There is to me slight difference between RP vs FP. RP sounds more linear, more balanced than FP. RCA are very smooth but not enough 'dynamite' in sound like TS's. NU is OK, neutral and nice bot not as powerfull in sound as TS RP.
7/2/15 at 3:16pm