EXPERT Columbia Conversion. 1930

This conversion by Ginn suggests it was the prototype for the EXPERT Senior.

To go into competition with E.M.G, Ginn had to come up with a new gramophone design. One that did not infringe copyrights but surpassed the performance of the E.M.G Mk Xa. Previously, Percy Wilson had suggested one of the ways to improve the Davey Isophonic horn was to reduce the number of bends. He had even suggested a shape for the horn. The soundbox was based on the E.M.G soundbox which E.M.G did not hold a patent for. David Phillips genus with soundbox tuning created the new EXPERT 4-spring soundbox. The overall result was the birth of the EXPERT Senior.

This prototype is built on the body of a Columbia cabinet gramophone. An E.M.G tonearm and conduit are evident. The EXPERT Senior in its conception. With no real support in the horn, It is surprising that it has lasted as long as it has without collapsing. The soundbox is interesting as it is not drilled for triangular bamboo needles. Overall the performance of this conversion is remarkable. The following EXPERT Senior was a huge improvement, solving all the faults in this conversion model.