Selectron

The selectron [15] is a multi-electrode
cathode ray tube, by design significantly
different from previously described. Electrodes at this
the tubes are concentrically arranged. The cathode represents
a series of core elements located in
one plane. Between these elements in the plane
cathode are located mutually perpendicular to two groups
selection rods forming a lattice through
primary electrons can pass.

Behind the selection rods are located
mesh and dielectric screen mounted on
tally base, acting as a signal
plates. The screen is irradiated by primary electrons
unfocused beam. However, the electronic flow from
the cathode can go to the screen only through that cell,
formed by four rods, which has
living potential.

To apply positive voltage to
rods from the rods are combined
with each other so that with a minimum number of conclusions
from the tube it was possible to select any
cells. It turns out that to supply a positive voltage
zheniya on A cells of the selectron it is enough to deduce from it
n wires, where n = 4 IA. So, for the selectron with
4096 cells is enough to have a total of 32 outputs, which
provide control of any cell.

The principle of operation of the selectron is based on the fact that
primary elements of the screen ‘radiated by primary electrons can
take two equilibrium potential values: either
cathode potential or collector potential.

Information is recorded by submitting to
signal plate positive (in case of recording 1)

or negative (in the case of writing 0) voltage with one
by opening the desired cell at a time (according to the address).
In this case, the selected screen element acquires the potential
tial depending on the control signal.

For reading, it is also required by applying to the corresponding.
positive selector pulse plates
polarity open the desired cell. Arisen in re.
as a result of irradiation of the screen element, the current impulse is used
is used as the output signal.


[15]  Knoll and Kazan