Experiments – Electronic Vacuum Valves or Tubes

Experimenting with 1j18b

By Michael Watterson Posted on 29th Apr 2014 Posted in Experiments, Russian Rod Pentode, Uncategorized

Experimenting with Russian Rod Pentodes Here is Russian 1j18b (aka 1zh18b, 1sh18b really 1Ж18Б ) on IC breadboard. The 1j24b and 1j29b are actually better purchases. Testing 5.4MHz Hartley Oscillator at 16V and 25V. 1j18b with 1.2V NiMH for filament …

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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.
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.
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: Experiments

Experimenting with 1j18b