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GE 2B23 magnetically controlled diode

Size This valve measures 81x32mm overall and has an octal base

This is a high vacuum diode designed to make use of a magnetic field, supplied by an external soleniod, to control the anode current. The action is the same as in a magnetron, where as the magnetic field is increased the electron stream spirals until it no longer reaches the anode, at which point the valve cuts off sharply.

Heater voltage 6.3V
Heater current 300mA
Average characteristics (Va=100, Ia=8mA)
Field strength 55 gauss
Minimum control sensitivity 2mA/gauss
Direct-current amplifier
Max DC anode voltage 150V
Max anode dissipation 5W
Load resistance 6k ohms
Approx change in load voltage with change in field strength at centre of operating range 2.5V/gauss
Anode current operating range 0 to 11mA, 30mA max
Field strength operating range 100 to 50 gauss
Electronic switch
Typical anode voltage 100V
Typical anode dissipation 1.6W
Load resistance 100 ohms
Sensitivity at centre of control range 2.5mA/Gauss
Anode current at 50 gauss 14mA (30mA max)
Anode current at 70 gauss 0.2mA approx.




Pin Function
1 i/c
2 Heater
3 Anode
4 no pin
5 i/c
6 no pin
7 Heater
8 Cathode


In Physical Review, V81, No. 2, Jan 15, 1951, the paper "Fine structure of the hydrogen atom. Part II" where it was employed in a circuit to stabilise the current applied to a magnetic coil.

In Physical Review, V91, No. 6, Sept 15, 1953, the paper "Molecular beam investigation of rotational transitions. I. The rotational levels of KCI and their hyperfine structure" it is referred to as a cylindrical magnetron diode. In the apparatus the 2B23 was used operating in the cutoff region to control the frequency of a klystron. An error signal, generated by the beat frequency between a crystal source and the klystron output was fed to the magnetic solenoid round the 2B23, the diode output then controlling the repeller of the klystron.

Donated by Bill Wagner; data provided by Ludwell Sibley

This file was last modified 15:53:05, Tuesday September 02, 2014

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