Experiment Topics: ..
The following topics can be discussed with this Helium-filled, partial-vacuum electron tube:
• Discharge, evidence of positive charge carriers
• The IA – UA characteristic of a thyratron
• Non-self-sustaining discharge
• Self-sustaining discharge
• Simplified Franck-Hertz-set-up

Product Information: ..
The gas triode is a Helium-filled tube with a pure tungsten heater filament (cathode) and a round metal plate (anode) with a wire grid between them, all inside a clear glass bulb. The cathode, anode and grid are all aligned parallel to one another. This planar configuration corresponds to the conventional symbol for a triode. A circular metal plate attached as a backing to the filament ensures that the electric field between the anode and cathode is uniform.
The gas triode allows recording of the IA – UA characteristic of a thyratron, observation of excited and non-excited discharge and of the discontinuous transfer of energy by helium atoms in inelastic collision with free electrons (simplified Franck-Hertz-set-up).

Specifications: ..
Gas filling: Helium
Filament voltage UF : max. 6,3 V AC/DC
Anode voltage UA : max. 500 V DC
Anode current IA : typ. 10 mA at UA = 300 V
Grid voltage: max. 30 V
Glass bulb: 130 mm Ø approx.
Length of tube: 260 mm approx.