. Electronic apparatus for biological research . Figure be borne in mind that so far as speed of transition is concerned this is a triode, not a pentode, multi-vibrator, as there is now considerable Miller capacitance from screens to control grids. Cathode coupled multi-vibrators Consider a circuit like Figure V^ is a cathode follower and V^ a triode amplifier. If K^ grid is made very negative with respect to earth, V^ is cut off and V^ acts as an amplifier valve automatically biased by R^ to some anode current such that the anode potential is, say, V^. HT-f

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