Abstract: An electrically adjustable current divider means divides the output current of a constant current generator into a plurality of portions, a first of which is applied as tail current to a long-tailed-pair amplifier connection of transistors for controlling its voltage gain. At least one of the long-tailed-pair transistors has a resistive load; the quiescent value of the output voltage developed across this load has an undesirable tendency to exhibit shifts as gain is controlled. A second portion of divided output current from the constant current generator, exhibiting changes in magnitude complementary to those exhibited by the first portion, is applied to current-to-voltage converter means for developing voltage components to counteract the above-mentioned tendency towards shifts in the quiescent value of the output voltage as gain is controlled.