Since it is economically advisable to attach the single choke coil of the current supply control of the synchrotron magnet to a large ring choke, the technical feasibility of constnacting such a large unit must be investigated. Therefore a model ring choke was designed and constructed. The constnaction and design of the ring choke model are described in detail and its parameters are tabulated. The parameters of the magnetic current supply are also presented. (J.S.R.)