Since below cutoff the plate current ceases to respond to the grid voltage, the voltage on the grid must remain above the cutoff voltage for faithful ( linear ) amplification.
12.
This tendency can be reduced by a process known as periodic reverse, where the plating current is reversed for short periods during electroforming and the excess is preferentially etched away.
13.
Where EPC is the end plate current, g ACh is the ionic conductance activated by acetylcholine, V m is the membrane potential, and E rev is the reversal potential.
14.
Plate detectors are used in both pF to 0.002 �F for triodes, or 250 pF to 0.001 �F for tetrodes and pentodes ) is used to regulate plate current.
15.
A related equation ( which is derived from the more general equation above ) determines the magnitude of an end plate current ( EPC ), at a given membrane potential, in the neuromuscular junction:
16.
The input signal is able to perturb ( change ) the potential of the grid, this in turn will change the anode plate so hence on many designs the anode current is named the plate current.
17.
Those other designs offer lower voltage gain ( traded off for higher plate current ) than the 12AX7 ( which has a voltage gain or A _ v of 100 ), and are more suitable for high-frequency applications.
18.
One reason for SETs being ( usually ) limited to low power is the extreme difficulty ( and consequent expense ) of making an output transformer that can handle the plate current without saturating, while avoiding excessively large capacitive parasitics.
19.
This causes a downward " kink " in the plate current vs . plate voltage curve " ( graph below, grey region ) " when the screen grid is biased at a higher voltage than the plate, as described below.
20.
In most modern tetrodes, to prevent parasitic oscillations the plate is given a coating which drastically reduces the unwanted secondary emission, so these tubes have virtually no negative resistance " kink " in their plate current characteristic, and cannot be used in dynatron oscillators.
