Recommended to read:

Using Tube Curves - Load Line Calculations Tube CAD Journal - Extrapolation from Plate Curves Tube CAD Journal - The Grounded-Cathode Amplifier The Valve Wizard - Heater / Filament Supplies

Calculated Gain and Output Impedance

Tube gain (from tube manual or spec sheet)   mu * Ri (the internal plate resistance of the tube )    Ohms * Rk1    Ohms * Rk2    Ohms * Gain (Not Bypassed)  =  dB Gain (Bypassed)  =  dB Impedance Output (Not Bypassed) Ohms Impedance Output (Bypassed) Ohms * = required values

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