One stage of amplification included in the stabilizing circuit of the Bedell‐Reich oscilloscope, which comprises a cathode‐ray tube with linear time‐axis for observation of periodically varying quantities, extends the frequency range of the instrument and permits stabilization without disturbance to the circuit under test. Although not primarily intended for use beyond the audio range, the instrument has in this way been stabilized above 100,000 cycles. Curves are given showing the use of the instrument for the study of non‐electrical quantities (as sound and light) as well as of electrical quantities (as in the study of modulation and rectification).