I have a Doge 8 preamplifier that uses 12AT7/ECC81 in the line stage. it has a quad of circa 1972 GE JAN 12AT7WC in it and it sounds pretty nice. i have a matched quad of early sixties Telefunken ECC81 angle getters coming from a reputable guy in Germany. has anyone rolled line stage tubes in this particular circuit and if you have what were your results? thanks, William
