Instead of the previously used single post-deflection acceleration electrode, high-performance CRTs in the 1940s/1950 began using a series of separate accelerator electrode bands applied to a cylindrical bulb. These bands were separated by insulating bands, and supplied with progressively higher voltages through individual HV connectors.
A disadvantage of this scheme is the additional distortion and compression it causes.
Multi-band accelerators were replaced by spiral accelerators in the course of the 1950s.
- Peter Keller, The Cathode-Ray Tube: Technology, History, and Applications, pp.103-104. Palisades Press, 1991. ISBN 0963155903, 9780963155900 → online copy
- Oscilloscope Cathode-Ray Tube Concepts, Chuck Devere, 1969; p.47+
- Design and development of a non-compressing post-deflection method for CRTs (Perkins, 1967)