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Common-cathode stage, unbypassed cathode:
Tube gain (from tube manual or spec sheet) mu *
Rp (value of resistor between plate and power supply)  kOhms *
ra (the internal plate resistance of the tube )  kOhms *
Rk (value of cathode resistor)  kOhms *
Gain  =  dB
Output Impedance Anode
Output Impedance Cathode
* = required value




Common-cathode stage, bypassed cathode:
Tube gain (from tube manual or spec sheet) mu*
Rp (value of resistor between plate and power supply)  kOhms *
ra (the internal plate resistance of the tube )  kOhms *
Rload (resistance of the next stage)  kOhms
Gain  =  dB
Output Impedance Anode
* = required value




  Calculate Cathode Bypass Capacitor

Known Lowest frequency to be amplified Result
mu
Rk Ohms
RL Ohms
Ra Ohms
fmin Hz

Attenuation at this frequency:
dB
Capacity:
Ck = uF