The drift mobilities of carriers in amorphous charge-transfer complexes of PVCz-TNF were obtained by Time-of-Flight. Differences in the transport characteristics between electrons and holes were observed. The transient current trace of electrons has a knee by which the transit time can be determined, but. the current trace of holes is featureless indicating that tT is dispersive. The transient current of holes can be analysed by Scher-Montroll theory. At low electrical field μh is independent of the field. Combining the results of dark conductivity measurements, we conclude that the non-ohmic conductivity at high field is contributed by the field-dependent mobilities and carrier concentrations that are both increasing with the field strength.