Abstract :
The advantages, to be gained in a projection receiver by dispensing with the mains transformer are discussed. Details of various unsuccessful attempts to achieve a satisfactory unit for operation from 170-V main h.t. supply line are outlined. It is concluded that a method of combining high-voltage pulses from the line output circuit and from an e.h.t. generator offers the most practical solution. A complete time-base unit from the grid of the synchronizing pulse separator onwards, is then described, particular attention being given to the more novel features. Some aspects of a new frame separator are first discussed, and then a description is given of the e.h.t. and scanning output circuits with the associated regulating circuit. From a comparison of components used it is shown that the circuit enables a saving in cost to be achieved.
