Teltron Tube - Dual Fine Beam, Gas filled
Product Code : EL-AS-10812
Quick Answer: Teltron Tube - Dual Fine Beam, Gas filled is a part-evacuated, neon-filled electron tube with tangential and axial electron guns, used to determine specific charge e/m and to observe spiral electron paths.
Last updated: October 2026
Key Features
- Neon at low pressure makes the electron paths visible as fine luminescent beams with an orange glow
- Two guns with indirectly heated cathodes, one axial and one tangential, selected by a switch on the cylinder cap
- Tangential beam can be turned into a completely circular path with Helmholtz Coils for e/m measurements
- Axial gun with a co-axial field shows spiral paths; phosphor-coated screen at the end
- Beam angle adjustable by miniature deflection plates via 4 mm connections
Technical Specifications
| Specification | Value |
|---|---|
| Anode voltage | 120-300 V DC |
| Maximum anode current | 30 mA |
| Maximum deflection voltage | 50 V DC |
| Maximum filament voltage | 7.5 V AC/DC |
| Glass bulb | Approx. 130 mm diameter |
| Total length | Approx. 260 mm |
About This Product
With the tangential gun and a perpendicular magnetic field, the diameter of the beam circle gives the specific charge of the electron. Free path studies and effects such as screen blanking from charge build-up can also be observed. Operation needs a universal stand, a bench power supply for the filament, 4 mm leads, Helmholtz Coils with a college power supply unit, and two EHT power supplies with 4 EHT experiment leads. The Teltron Tube - Dual Fine Beam, Gas filled is available for supply within India and for export to Mauritius, Argentina, Moldova, Philippines, South Korea and Croatia.
Frequently Asked Questions
Q1. How are the two electron guns selected?
Either gun is selected by a switch on the cylinder cap. One gun points along the tube axis and the other is tangential to it.
Related: Atomic Structure, Helmholtz Coils, Teltron Tube - Electron Diffraction.
For a quotation on the Teltron Tube - Dual Fine Beam, Gas filled, contact School Equipments India.
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