Abstract :
Starting from very fundamental postulates, and by use of scaling theory, this paper deduces the relationships between all the basic parameters of any c.r.t., such as overall length, screen diameter, spot size, beam voltage, beam current, cathode loading, grid drive, etc., etc. The theory is exact within its postulate framework for transformations in which the beam angle ¿ is invariant. On the other hand it is proved that for any transformation even if aberrations are present, provided only the beam angle diminishes, then the derived tube will have a performance at least equal to that predicted. Practical illustrations of the use of the theory are included, showing how easily we may deduce many relationships of importance in c.r.t. design work. An Appendix justifies the validity of the basic assumption¿that the deflection defocusing is proportional to f(¿)z¿. It is shown that with proper interpretation this expression applies both to magnetic and electric deflection.
