A new d. c. high voltage stabilizer, operating in the range from +5 to +50 kilovolts and for currents up to 50 milliamperes, is described. The stabilizer is of the usual degenerative type; but the series regulator tube, which is at high voltage, is inductively coupled to the feed‐back amplifier at ground‐potential. The signal from the amplifier amplitude‐modulates an r‐f oscillator, the output voltage of which is passed through a transformer, rectified, filtered, and applied as a d. c. correcting signal to the series tube grid. Insulation between high and low voltage circuits is provided in the r‐f transformer.As an example of the short‐term stabilizing action, a level of +35 kilovolts can be maintained to within 2 volts, for ±5 percent change in the input voltage, independently of load up to 50 milliamperes. The output ripple at this voltage and 20‐milliamperes load is 0.05‐volts r.m.s. Long‐term stabilization, which depends chiefly upon constancy of the reference level, has not been measured, but means to its attainment are suggested.