The paper describes method for accurate emulating of triode behavior at high input levels. Under gross overload the grid current becomes a main origin of distortion. The measurements of grid current for popular 12AX7 triode are presented. In the region of interest grid current dependence on input signal is emulated with a simple circuit. The output harmonic weighting of the emulator is examined and compared with existing solution. The results can be applied to solid-state guitar amplifiers.
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