| 摘要 |
The thief cathode circuit of the electron gun with an indirectly-heated rod cathode consists of the auxiliary cathode in the form of a spiral located inside the cylindrical heat shield. Characterized in that: The heat shield (3) has the opening (4), located at the base directed towards the front of the rod cathode. One of the terminals of the auxiliary cathode is led out through the opening (4). The shield also has the opening (5), which allows the other terminal of the auxiliary cathode to be led out. The heat shield (3) is permanently secured in the connection clip (6) in the form of a round plate with the height slightly smaller than the height of the shield (3) above the opening (5). The plate has three tapped openings (8) along the shared diameter, which accommodate threaded bolts (10). It also has one smooth opening (9), which accommodates the bolt (11), insulated from the connection clip (6) by means of the insulating sleeve (12). The terminal of the auxiliary cathode, which is led out through the opening (4), is connected to any threaded bolt (10). The auxiliary cathode terminal which is led out centrally, through the opening (5) in the shield (3), is connected to the bolt (11). The front surface of the shield (3) with the opening (4) is closed with the lid (15). The bottom of the lid has a conical indentation (17) on the external side.
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