The spin-density-wave contribution to the electric transport gives ris
e to novel nonlinear conduction phenomena in (TMTSF)2PF6. In the tempe
rature range of the typical sliding conduction there are significant i
nternal mode excitations and the coupling to the one-electron excitati
ons controll the dynamics of the condensate. At lower temperatures, be
low T = 1 K, a new type of collective spin-density-wave transport emer
ges as the normal carriers freeze out. The current density follows a t
unneling expression, and the parameters are suggestive for excitations
well below the single particle gap.