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2. Control grid - Wikipedia

   en.wikipedia.org/wiki/Control_grid

   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 ...

3. Tube tester - Wikipedia

   en.wikipedia.org/wiki/Tube_tester

   The mutual conductance tester tests the tube dynamically by applying bias and an AC voltage to the control grid, and measuring the current obtained on the plate, while maintaining the correct DC voltages on the plate and screen grid. This setup measures the transconductance of the tube, indicated in micromhos. [3]

4. Pentode - Wikipedia

   en.wikipedia.org/wiki/Pentode

   The control grid of the variable-mu pentode is constructed so as to result in a given incremental change of control grid voltage having less effect on change of anode current as the control grid voltage increases negatively relative to the cathode. [7] The control grid often has the form of a helix of varying pitch. [8]

5. List of vacuum tubes - Wikipedia

   en.wikipedia.org/wiki/List_of_vacuum_tubes

   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 ...

6. Plate detector (radio) - Wikipedia

   en.wikipedia.org/wiki/Plate_detector_(radio)

   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 ...

7. Grid-leak detector - Wikipedia

   en.wikipedia.org/wiki/Grid-leak_detector

   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.