. Electronic apparatus for biological research . reasing Figure Figure of this is that the negativity of the grid reinforces the effect of the space charge in reducing the anode current, and a higher anode voltage is necessary to achieve the same anode current. Figure is called the 'anode charac- teristic' of the valve. There are three fundamental 'valve parameters' which describe the per- formance of a triode. They are: (1) ,a, the ampUfication factor; (2) g„„ the mutual conductance; and (3) r^, the anode incremental resistance. jLi is defined as {SVjdVg)j^ and is the most nearly

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. Electronic apparatus for biological research . reasing Figure Figure of this is that the negativity of the grid reinforces the effect of the space charge in reducing the anode current, and a higher anode voltage is necessary to achieve the same anode current. Figure is called the 'anode charac- teristic' of the valve. There are three fundamental 'valve parameters' which describe the per- formance of a triode. They are: (1) ,a, the ampUfication factor; (2) g„„ the mutual conductance; and (3) r^, the anode incremental resistance. jLi is defined as {SVjdVg)j^ and is the most nearly constant of the valve parameters, both with regard to the age of the valve and to the particular voltages and currents at which it is worked, /n is a pure negative number. 135

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