Common-Cathode Stage,
un bypassed cathode

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

Common-cathode stage, un bypassed cathode:

Tube gain (from tube manual) mu *
Rp (value of resistor between plate and power supply)  Ohms *
Ri (the internal plate resistance of the tube )  Ohms *
Rk (value of cathode resistor)  Ohms *
Gain  =  dB
Impedance Output [1] Anode Ohms
Impedance Output [2] Cathode Ohms
Input coupling capacitor: Because the grid is now at a high DC potential it will require a coupling capacitor to block the DC from upsetting previous stages.
I will choose an arbitrary reactance of 1Meg at a low frequency of 5Hz and calculate the value.
* = required values

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