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1 – Tetrode with a space charge grid (the 2nd grid is the control grid) 2 – Tetrode with a screen grid (the 1st grid is the control grid) 3 – Power pentode; 4 – Binode, a diode/triode or diode/tetrode; 5 – Remote-cutoff RF tetrode; 6 – Signal pentode; 7 – Remote-cutoff RF pentode; 8 – Sharp-cutoff hexode frequency changer; 9 ...
The control grid is an electrode used in amplifying thermionic valves (vacuum tubes) such as the triode, tetrode and pentode, used to control the flow of electrons from the cathode to the anode (plate) electrode. The control grid usually consists of a cylindrical screen or helix of fine wire surrounding the cathode, and is surrounded in turn by ...
Older testers may call themselves Plate Conductance if the ammeter is in series with the plate, or Cathode Conductance if the meter is in series with the cathode. [1] The problems of emission testers are: they do not measure key characteristics of tubes, like transconductance; they do not perform the tests at real load, voltages and currents
EF37/6J7 – Sharp-cutoff pentode for use as a tuned RF amplifier, a (second) detector, or an AF amplifier; octal base with control grid on top-cap; EF38 – EF8 with an Octal base [2] EF39/6K7 – Remote-cutoff RF pentode for use as an IF amplifier or as a superheterodyne mixer (1st detector). Also used in test equipment.
A triode has three electrodes: the anode, cathode, and one grid, and so on. The first grid, known as the control grid, (and sometimes other grids) transforms the diode into a voltage-controlled device: the voltage applied to the control grid affects the current between the cathode and the plate. When held negative with respect to the cathode ...
Plate detector circuit with cathode bias. Cathode bias RC time constant three times period of lowest carrier frequency. C L is typically around 250 pF.. In electronics, a plate detector (anode bend detector, grid bias detector) is a vacuum tube circuit in which an amplifying tube having a control grid is operated in a non-linear region of its grid voltage versus plate current transfer ...
Grid leak detection optimized for operation in this region is known as power grid detection or grid leak power detection. [29] [30] Grid current occurs only on the positive peaks of the carrier frequency cycle. The coupling capacitor will acquire a dc charge due to the rectifying action of the cathode to grid path.
Between the screen grid and the cathode is the control grid. The beam confining plates have been removed. The getter pan, getter pan supports and the upper mica disc have been removed. The elliptical helix of the screen grid surrounds the control grid. The screen grid support rods are on the left and right outside of the control grid support rods.