The problem of automatically controlling the gain of a pulse amplifier with an electric signal is discussed. A simple electrically controlled variable-gain pulse amplifier is described. Different types of variable-resistance control elements are considered: GE344 and Pinlite 15-15 lamp bulbs and field-effect transistors (FET's). An important use of a variable-gain pulse amplifier is in gain-stabilized systems in nuclear instrumentation. We constructed an electrically controlled variable-gain amplifier that permits up to ± 1 V pulses with gain-change capabilities of ± 21%. It is a simple, low-cost compact unit that can be introduced into existing stabilizer systems without changing its components. Incremental linearities of 0.08% or better can be expected. Gain modulations up to 100 kc have been accomplished with FET's. Very good results are obtained with lamp bulbs when lower speeds can be tolerated, as is the case for a great many present-day experiments.