The effects of the exciting magnetic field as well as of the bias magnetic field applied at the exciting or receiving points for Fe77.5Si7.5B15amorphous magnetostrictive wire, used as delay lines, have been investigated. Amorphous wires have been tested in the as-cast state and after the stress-relief process. The increase in the value of the exciting magnetic field leads to an increase in the value of the pulsed voltage output. The maximum values for the pulsed voltage output are obtained for about 5 &mgr;s pulse width and 15 A amplitude of the pulsed exciting current. The dependence of pulsed voltage output on the bias magnetic field at the exciting or receiving points is not monotonic for all tested samples. The maximum response is obtained for about 100–200 A/m and 100–300 A/m bias magnetic field applied in exciting and receiving points, respectively. ©1997 American Institute of Physics.