. Electronic apparatus for biological research . HT+ HT- Figure Figure Gain balance We have seen earlier thattit is particularly important to arrange that the gain of the two halves o^Xht first amphfying stage be made equal, and this is achieved by a differential gain control, one which increases the gain of one half and reduces it in the other. This may conveniently be achieved by differential variation of the anode loads {Figure ). If the valves can be selected for ^,„'s within, say, 5 per

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