Resistive transitions and dc transport critical currents were measured on YBa/sub 2/Cu/sub 3/O/sub 7-x/ pellets. The samples were fabricated by the powder method at sintering temperatures ranging from 900 to 940 degrees C. They had a relative density higher than 92% of the theoretical density assumed equal to 6.36 g/cubic cm. The dependence of the critical current upon a weak applied field, up to 3 m Tesla, at liquid nitrogen temperature, was investigated. For a few samples, the temperature dependence of the resistance was measured in a magnetic field up to 5 Tesla. In this paper, the results were analyzed in terms of differences in sintering conditions.