spice distortion dynamics of tube power amps

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The problem is not Spice. Overdrive, by definition, is pushing a device, tube or otherwise, into it's non-linear region. Its just like trying to simulate a real transformer - its really difficult to accurately incorporate both linear and non-linear behaviour in the same model.
All the tube models I've seen, created and used are really good if they do a half-way decent job in the "linear" region, let alone in the saturation/cut-off region.
B.
 
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