A report is presented on a study of single emitter layer metal base transistors with a base terminal made of aluminum grids.The latter exhibits low operating voltage associated to the high resistivity of the collector terminal and also shows very low leakage current.With such a single emitter layer, common-emitter current gain, on/off current ratio, and cutoff frequency of, resp., 239.62, 3.8 × 107, and 1.4 MHz, were obtained.