Teltron Electron Deflection Tube D
Product Code : JLI-PLE-10554
Quick Answer: The Teltron Electron Deflection Tube D is a highly evacuated electron tube with a focusing gun and an inclined fluorescent screen that shows the beam path. The beam can be bent by its built-in plate capacitor or by the Helmholtz coil pair D, so e/m and electron velocity can be found.
Last updated: 18 October 2026
Key Features
- Fluorescent screen inclined to the beam axis makes the beam path visible.
- Electric deflection by the built-in plate capacitor.
- Magnetic deflection using the Helmholtz coil pair D.
- Balancing the electric field against the magnetic deflection gives the specific charge e/m and the electron velocity.
Technical Specifications
| Specification | Value |
|---|---|
| Filament voltage | 6.3 V AC |
| Max. anode voltage | 5000 V |
| Anode current | Approx. 0.1 mA at 4000 V |
| Max. capacitor voltage | 5000 V |
| Fluorescent screen | Approx. 90 x 60 mm |
| Glass bulb diameter | Approx. 130 mm |
| Total length | Approx. 260 mm |
How It Is Used
The tube is used to study how electric and magnetic fields bend an electron beam. Adjusting the plate voltage until the electric deflection cancels the magnetic deflection from the Helmholtz coils lets students calculate the specific charge e/m and the speed of the electrons.
Frequently Asked Questions
How is e/m found with the Teltron Electron Deflection Tube D?
The electric field of the built-in plate capacitor is adjusted until it cancels the magnetic deflection from the Helmholtz coil pair D. From this balance the specific charge e/m and the electron velocity can be determined.
What anode voltage does the Teltron Electron Deflection Tube D take?
The maximum anode voltage is 5000 V, with an anode current of approx. 0.1 mA at 4000 V. The filament runs at 6.3 V AC.
Related Physics Lab Equipment
See the full physics lab equipment range, or these related D-series electron tube items:
- Teltron Helmholtz Pair of Coils D
- Teltron Tube Holder D
- Teltron Electron Diffraction Tube D
- Teltron Dual Beam Tube D
- Digital Voltmeter/Ammeter With Shunts
Export orders for the Teltron Electron Deflection Tube D are accepted from schools, colleges and distributors in Tunisia, Mali, United States, Bahamas, Sierra Leone and Jamaica.
For a quotation on the Teltron Electron Deflection Tube D, contact JLab India on +91-8569909696.
