  The paper deals with a simple spherical mean-field dynamo model of
$\alpha^2$-type in the case of high electrical conductivity. A spherically
symmetric distribution of turbulent motions is assumed inside a spherical fluid
body surrounded by free space, and some complete form of the corresponding mean
electromotive force is taken into account. For a turbulence lacking
reflectional symmetry finite growth rates of magnetic fields prove to be
possible even in the limit of perfect conductivity, that is, the model
corresponds to a fast dynamo. In accordance with the theorem by Bondi and Gold
the dynamo-generated field is completely confined in the fluid body.
