File:Инверсия анодного тока ВАХ тетрода 24А.PNG

Description
Русский: Динатронный эффект в тетроде RCA 24A (ранних серий, выпуск 1930 или ранее) с инверсией анодного тока.
English: Plate current vs voltage curve of an early tetrode vacuum tube, an RCA 24A from 1930 or earlier, showing region of negative slope (negative differential resistance) used in dynatron oscillators. When electrons from the cathode strike the plate, they can knock other electrons out of it which are attracted to the high potential on the screen grid. Due to this secondary emission of electrons, the plate current can actually decrease with an increase in plate voltage. This negative resistance is used in the dynatron oscillator circuit to create oscillations in a tuned circuit. Modern tetrodes have their plate treated to inhibit secondary emission, so they don't have this negative resistance region.
  • Ik is cathode current
  • Ia is plate (anode) current
  • Ic2 is screen grid current
  • Ua is plate voltage
  • Uc2 is screen grid voltage
The horizontal axis is ratio of screen voltage to plate voltage. It can be seen the negative resistance only occurs when the screen grid is at a significantly higher potential than the plate, to attract the secondary electrons away from the plate.
Date 1 February 2012 (upload date)
Source Own work по данным: Рейх, Г. Дж. Теория и применение электронных приборов — Ленинград: Госэнергоиздат, 1948. - с. 90-91
Author user:Retired electrician
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Category:PD ineligible#Инверсия%20анодного%20тока%20ВАХ%20тетрода%2024А.PNG Category:Vacuum tetrode diagrams Category:Device current-voltage characteristics Category:RCA vacuum tubes Category:Negative resistance
Category:Device current-voltage characteristics Category:Negative resistance Category:PD ineligible Category:RCA vacuum tubes Category:Vacuum tetrode diagrams Category:Vector version available