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There has been investigated a wave regime of operation of vacuum transmission lines in the presence of a supplemental magnetic field due to a current from an external source applied to the central electrode of the coaxial line. Experiments were performed in the 100–600 kV voltage range. The introduction of a supplemental magnetic field makes it possible to control the propagation velocity of the wave front the magnitude of the "hot" impedance and to considerably decrease the energy losses at the front. The minimum values of magnetic biasing current required to eliminate leakage currents at the wave front are in close agreement with calculated values.