[en] A wide-band linear amplifier with electronic adjustment of the gain within +500-1000 is described. The amplifier circuit consists of three cascades with negative voltage feedback. The cascades are connected in direct current and their gains under rate conditions are 10, 10, 5 respectively. The constant current ''zero'' stability is achieved by providing a deep nonlinear negative feedback with an operational amplifier. The amplifier pass-band is 0.04 Hz-5MHz (within the total amplitude range). The noise level reduced to output is 90 mkV. The output amplitude range for a 50 ohm load is -0+6 V. The block diagram of the amplifier and the key diagrams of the first and amplifying cascades are presented