Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 NEGATIVE VOLTAGE FEEDBACK AND THE STABILIZED GAIN AMPLIFIER If the valve is a pentode Rj^ <^ r„ and the output impedance is given with sufficient accuracy merely by 1/^^. For both triode and pentode it is real and positive, meaning that the output impedance is resistive. ^,„ is typically 5 mA/V, giving an output resistance of only 200 This is very low com- pared with the output resistance of an amphfying stage, which is for a pentode substantially equal to the l

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Electronic apparatus for biological research Electronic apparatus for biological research . electronicappara00dona Year: 1958 NEGATIVE VOLTAGE FEEDBACK AND THE STABILIZED GAIN AMPLIFIER If the valve is a pentode Rj^ <^ r„ and the output impedance is given with sufficient accuracy merely by 1/^^. For both triode and pentode it is real and positive, meaning that the output impedance is resistive. ^,„ is typically 5 mA/V, giving an output resistance of only 200 This is very low com- pared with the output resistance of an amphfying stage, which is for a pentode substantially equal to the load, say 100,000 Q. {Figure ), and HT + 9r ,f>Vo

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