. Electronic apparatus for biological research . ' 1^2 grid Figure Figure If Ki is a pentode we have Figure which reduces to Figure It is clear that Figures and are simple low-pass filters whose performance may be calculated in the usual way. Evidently the high frequency response is best when: (1) râ and the load Rl ^yggmRC' â 1^2 grid Ci*Cgk Figure resistance of V-^ are low; (2) the input capacitance of V^ and the stray capacitances are low. (1) is achieved by making V-^ a triode rather than a pentode. (2) is achieved by making V^ a pentode, because pentode

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. Electronic apparatus for biological research . ' 1^2 grid Figure Figure If Ki is a pentode we have Figure which reduces to Figure It is clear that Figures and are simple low-pass filters whose performance may be calculated in the usual way. Evidently the high frequency response is best when: (1) râ and the load Rl ^yggmRC' â 1^2 grid Ci*Cgk Figure resistance of V-^ are low; (2) the input capacitance of V^ and the stray capacitances are low. (1) is achieved by making V-^ a triode rather than a pentode. (2) is achieved by making V^ a pentode, because pentode input 155

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