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/DCMaximum anode voltage: 500 VAnode current: 2.5mA at 300VRequires the following products to operate:B8A49463 - Universal StandHT Power Supply - to power the anode (*coming soon*)B8G85458 - Bench Power Supply - to power the filamentB8R06545 - 4mm Leads