Oscilloscope tube with travelling wave deflection system and large field of view

The frequency response of conventional deflection systems, i.e. the influence of the transit time, the rise time and oscillations, is discussed in a somewhat abbreviated form. It is shown that an unbalanced or balanced helix system offers great advantages for high-speed oscillography. A new travelling-wave oscilloscope tube is described which possesses a balanced helix system as signal plates. The tube has a very large field of view (1¿ in. by 4 in.) and an excellent frequency response (90 per cent. sensitivity at approximately 2000 Mc/s) while the sensibility is still in an acceptable range. The question of magnetic vs. electrostatic focusing in a high-speed oscilloscope tube is treated in detail. Typical operating conditions and the performance of the tube are described.