After a brief review of the history of the K2-W vacuum-tube op amp, an LTspice model is used to create its schematic in ...
Part 5 provides spec summary of the GP/R K2-W vacuum-tube op amp and discusses ... 100 MΩ. The LTspice modeled result shows 1.00 nA of input current. Early SPICE simulations based on that model ...
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