High-vacuum electron tube with thermionic cathode for demonstrating the thermoelectric effect (Edison effect). Use the tube to investigate the relationship between measured emission current and the voltage applied to the cathode. Also investigate the characteristics of diodes via the process of rectification.

The diode is used to show the basic thermionic effects in vacuum tubes, including:

• Current flow between an incandescent filament and a cold electrode (the Edison effect).
• Characteristic anode current/ anode voltage curves for different filament temperatures.
• Application of a diode as a rectifier.

The diode consists of a basic glass spherical body with a cylindrical neck, containing a tungsten filament with 4mm connection sockets in the plastic cap on the neck and a circular anode plate connected to a 4mm plug connection on the sphere.

• Operating instructions supplied.

Technical Specifications:

• Maximum filament voltage: =7.5 V AC/DC
• Maximum anode voltage: 500 V
• Anode current: 2.5mA at 300V

Requires the following products to operate:

• B8A49463 - Universal Stand
• HT Power Supply - to power the anode (*coming soon*)
• B8G85458 - Bench Power Supply - to power the filament
• B8R06545 - 4mm Leads