A vacuum toroidal field has been superimposed on a spheromak by means of an axial conductor. It has been observed that the resulting configuration corresponds to a tokamak with limiting low aspect ratio, i.e. a spherical torus with aspect ratio 1.1. The corresponding spheromak is unstable to n = 1 tilt and shift modes, but this tokamak configuration is found to be globally stable without additional passive stabilization.