Perveance

==Examples == The 6S4A is an example of a high perveance triode. The triode section of a 6AU8A becomes a high-perveance diode when its control grid is employed as the anode. Each section of a 6AL5 is a high-perveance diode as opposed to a 1J3 which requires over 100V to reach only 2mA. Perveance does not relate directly to current handling. Anothe...
Found on http://en.wikipedia.org/wiki/Perveance

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 on http://www.albacom.co.uk/Web/Site/defence/glossary.html

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 on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=841-30-31

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 on http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=531-17-18
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