1. 
   Perveance
   Is a measure of the relationship between the beam current and voltage of an electron beam. It is defined as the ratio of the cathode current to the 3/2 power of the anode voltage. Due to the size of this unit the normal unit used is the microperv.
   Found op http://www.albacom.co.uk/Web/Site/defence/glossary.html
   
   
2. 
   perveance
   the quotient of (1) the mean convection current by (2) the three-halves power of the voltage that corresponds to the mean kinetic energy of the charge carriers within a stated cross-section of the beam or by (2) the three-halves power of the voltage of the accelerating electrode
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=531-17-18
   
   
3. 
   perveance
   quotient of the mean convection current by the 3/2 power of the voltage that corresponds to the mean kinetic energy of the charge carriers within a stated cross-section of the beam or by the 3/2 power of the voltage of the accelerating electrode
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=841-30-31
   
   
4. 
   Perveance
   ==Examples == The 6S4A is an example of a high perveance triode. ...
   Found op http://en.wikipedia.org/wiki/Perveance
   
   

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