ALLIED'S ELECTRONICS DATA HANDBOOK

Vacuum Tube Formulas and Symbols

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Vacuum Tube Constants
  Amplication factor (Mu or u) is given by
   
  Dynamic plate resistance in ohms, is given by
   
  Mutual conductance in mhos, is given by
   

Vacuum Tube Formulas
  Gain per stage is given by
     
 
  Voltage output appearing in RL, is given by
 
 
  Power output in RL, is given by
 
 
 
  Maximum power output in RL which results when
RL = rp, is given by
     
  Maximum undistorted power output in RL which
results when RL = 2rp,is given by
     
  Required cathode biasing resistor in ohms, for a
single tube, is given by
     

Vacuum Tube Symbols
  Mu or u
rp
gm
Ep
Eg
Ip
RL
It
Es
 
=
=
=
=
=
=
=
=
=
=
Amplification factor,
Dynamic plate resistance in ohms,
Mutual conductance in mhos,
Plate voltage in volts,
Grid voltage in volts,
Plate current in amperes,
Plate load resistance in ohms,
Total cathode current in amperes,
Signal voltage in volts,
change or variation in value, which may be either an increment (increase) or a decrement (decrease).


Peak, R.M.S., and Average A-C Values of E & I

 
Given Value To get . . .
Peak R.M.S. Average
Peak   0.707 * Peak 0.637 * Peak
R.M.S. 1.41*RMS   0.9*RMS
Average 1.57*Average 1.11*Average  

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