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The first tubes used these nets, woven of fine wire. Then it became clear that the mass production of lamps are much more convenient to use a spiral wound to traverse, and that they are as good anode current control, as well as the present grid. Such spirals have begun to apply
almost all amplifier tubes, but the habit continued to call their nets. This name is preserved to this day.
Traverses of the top and bottom electrodes are fastened by means of small discs of mica. The whole structure is usually attached to the bottom of a glass tube, through which pass the findings from the cylinder electrodes. In some types of glass tubes to the bottom of the cylinder is attached with special glue plastic cap with metal legs, which are soldered to the findings of the electrodes. Plinth legs are in their slots tube panels, and thus the lamp is connected to the electrical circuits receiver or amplifier. Correct installation of the lamp provides a shaped protrusion on base - the key that falls into a special slot in the lamp panel.
In modern lamps so-called finger-series cap not, his role does the glass bottom of the container in which the fixed and thin contact pins. Among finger lamp with seven lamps there feet and with nine legs, which are available for a corresponding tube sockets seven or nine nests
Of all the electrodes lamp cathode deserves special attention.
All electrodes are connected to the lamp cap pins that are inserted into the socket tube panel. Through these slots and pins are connected to the electrode cap the various elements of the scheme, supplied voltage, the amplified signal is removed.
In lamps, powered by batteries (battery lamp directly heated) cathode is mounted on a thin thread of insulators, which forms the constant current intensity. If the power lamp is provided from the mains (Mains lamp heated), it is used for heating the cathode, and AC. Alternating current is passed directly through the cathode is undesirable and in some cases is simply unacceptable. One reason for this is that when the heating current (current is surely a variable!) Cathode temperature will be continuously modified. This will change the amount emitted, that is emitted from the cathode, electrons, and hence the anode current of the lamp. If the anode circuit of a lamp or turn the phone on speakerphone, then it will always hear a low tone - AC hum. |