Abstract: A broadband electron beam deflection apparatus particularly for a tube in which its electron beam can be focused, varied in position and varied in intensity, consisting in the form of a pair of helices each having a flat surface adjacent to the optical axis of the electron beam and also being precisely maintained in a diverging direction to such axis over the length thereof is provided. The apparatus consists of two individual helix assemblies each composed of separate components combined into a single unit in a manner whereby symmetry and desired characteristic impedance is controlled by the dimensions of the helix and having an end-to-end propagation time equal to the electron beam velocity due to the pitch and circumference of the helix.