. Electronic apparatus for biological research . Figure turn over at co,, = 1/(10^ X 10~^) = 10^ radians/sec. This is a frequency of only 10^/2-77 c/s, so the high frequency performance of the apparatus is hable to be disappointing. Suppose the pentode output is passed to the cable via a cathode follower of output resistance 200 Q, then the cut-off frequency will be 1/(2 X 10^ X 10-^) = 5 X 10^ radians/sec. This is quite a different story, and amply high for biological work. 175

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