  We propose a new mechanism for turbulent mean-field dynamo in which the
magnetic fluctuations resulting from a small-scale dynamo drive the generation
of large-scale magnetic fields. This is in stark contrast to the common idea
that small-scale magnetic fields should be harmful to large-scale dynamo
action. These dynamos occur in the presence of large-scale velocity shear and
do not require net helicity, resulting from off-diagonal components of the
turbulent resistivity tensor as the magnetic analogue of the "shear-current"
effect. Given the inevitable existence of non-helical small-scale magnetic
fields in turbulent plasmas, as well as the generic nature of velocity shear,
the suggested mechanism may help to explain generation of large-scale magnetic
fields across a wide range of astrophysical objects.
