Unification of high precision SPICE modeling for the series of MT vacuum tube has been succeeful for the first time. The model formula was validated based on the comparison of electrode and space physical dimensions among 12AX7, 12AU7, 12AY7, and 12AT7 associated with various aspects of properties not limited to the general Ip-Vp family curves. As a result, the non-linear behavior of the grid current and the plate current as a function of plus/minus grid voltage were able to be expressed entirely by 17 parameters of the newly proposed SPICE model, in which 4 tube type specific parameters and 4 universal parameters are constant and matching of twin valves of each tube as well as product dispersion are fitted by 9 variable parameters.
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