It really depends on the peice your placing them into. I have tried Telefunken and Bugle boy and didn't care for them any better than my Stock tubes.There is no such thing as the best,its all a matter of taste. I would suggest try some good used tube to see if the sound your getting is what your looking for. If you buy NOS and don't like them your out the money and they are not NOS any more to sell. Good luck
