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Home › View all posts by Michael Watterson

Author: Michael Watterson

HMV 2007R transportable record player

By Michael Watterson Posted on 13th Aug 2020 Posted in Restorations

I was surprised to see this in the local animal welfare charity shop. I thought it looked too large to be an attaché case radio and too small to be a record player. Though it was styled like many 1950s …

HMV 2007R transportable record player Read more »

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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herge-radio-1

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

 We’ll call this 1 valve Regenerative Radio “The Hergé” in honour of his research and attention to detail. (fun stories too) Hergé wrote that strip (in French) for the Belgian newspaper in 1934 or 1935 just after the Japanese invaded …

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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 …

Experimenting with 1j18b Read more »

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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.

© 2014 Michael Watterson, all rights reserved Except Donated, Manufacturer's or ex-Advertising content