Electronic apparatus for biological research Electronic apparatus for biological research electronicappara00dona Year: 1958 from generator EHT- Figure the grid leak to a point which is earthy during the forward strokes of the time base, but negative to earth (so that the valve is cut off) at other times. Hybrid cathode ray tubes These are a recent development in which the deflection is electromagnetic and the focusing is electrostatic. This retains the advantage of magnetic tubes, in that they are short in comparison with their screen size, and that good focus and brightness are
Electronic apparatus for biological research Electronic apparatus for biological research electronicappara00dona Year: 1958 from generator EHT- Figure the grid leak to a point which is earthy during the forward strokes of the time base, but negative to earth (so that the valve is cut off) at other times. Hybrid cathode ray tubes These are a recent development in which the deflection is electromagnetic and the focusing is electrostatic. This retains the advantage of magnetic tubes, in that they are short in comparison with their screen size, and that good focus and brightness are possible; the design is such that the requisite focusing anode potential with respect to the cathode is quite low, about 300 V, enabling both the focus and brightness potentials to be derived from potentiometers across the HT supply, and a negative-earthed EHT supply is used across which no resistor chain is necessary. Hence the drain on the EHT generator is low. Electrostatic focusing has an advantage over permanent magnet in that remote adjustment does not require complicated mechanical linkages, and over electromagnetic in that almost no power is consumed. It is certainly lighter and it is claimed that it is cheaper. Multi-channel cathode ray tube displays It is often valuable to be able to display two varying quantities simul- taneously, and we have discussed one method of doing this—the Cossor double-beam tube. Another is to have a number of electrode systems in one glass envelope, all projecting on to one screen; this scheme is feasible with electrostatic tubes but not with magnetic. Two-channel and four-channel tubes may be bought from stock, and eight-channel models to special order 469
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