Valve project – Electronic Vacuum Valves or Tubes

Herge-2

By Michael Watterson Posted on 4th Apr 2018 Posted in Russian Rod Pentode, Valve project

The finalised design has a generous gain Audio Amplifier that can even drive a loudspeaker via a transformer and actually needs a volume control on stronger stations! The finished Hergé radio (with reaction for volume) The theory is that …

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Definitioner

Grid: An intermediate electrode between the Cathode (or Filament on a direct type) and the Anode (Plate). Types of grid include "Control" (g1) which controls the electron flow, "Screen" (g2) which is an electrostatic screen between Anode and Control grid improving RF performance, "Suppressor" (g3) which suppresses secondary emission between the Anode and Screen grid. The Control g1 is usually more negative than Cathode, Screen g2 is usually at a higher voltage than Anode and Suppressor g3 usually at Cathode voltage. Physically the grids can be helical fine wire, a mesh, rods, plates. Rods or Plates need an electron beam.
filament (Cathode): The source of electrons in the device. if "indirect" then the cathode is tube with an internal insulated heater. A filamentary cathode is a filament heated by voltage across it which acts as the cathode.
Anode: The output electrode which collects most of the electrons, usually connected via a "load" to positive HT supply (B+). On a diode or rectifier with a positive output it is the AC in. On a rectifier or diode with earth or AC on the cathode it is the negative output.

Category: Valve project

Herge-2