Teltron Tube - Perrin
Product Code : EL-AS-10828
Quick Answer: Teltron Tube - Perrin is a highly evacuated electron tube with a focusing electron gun, an inclined fluorescent screen and a Faraday's pail, used to show that cathode rays consist of charged particles and to study electric and magnetic deflection.
Last updated: October 2026
Key Features
- Spherical glass body with cylindrical neck; diode electron gun with filament and cylindrical anode
- Faraday's pail in the sphere at 45° to the axis, connected via a 4 mm plug
- Beam deflected electrically by the built-in plate capacitor or magnetically with external Helmholtz Coils
- Internal phosphor coating at the end of the sphere forms a luminescent screen
- e/m and mean electron velocities can be found by field cancellation
Technical Specifications
| Specification | Value |
|---|---|
| Maximum anode voltage | 5 kV |
| Maximum capacitor voltage | 500 V |
| Maximum filament voltage | 7.5 V AC/DC or less |
| Anode current (4000 V) | 1.8 mA typical |
| Beam current | 4 µA typical |
About This Product
Charge accumulated in the Faraday pail does not disappear when the filament is switched off, showing that cathode rays must consist of charged particles. Cathode ray tube operation can also be shown using a secondary coil for the transverse field, and deflection sensitivity can be measured with Helmholtz coils. Operation needs a universal stand, a bench power supply for the filament, 4 mm leads, Helmholtz Coils, an EHT power supply with 3 EHT experiment leads and a college power supply unit for the coils.
Frequently Asked Questions
Q1. What does the Faraday pail show?
Charge can be accumulated in the pail and does not disappear when the filament is switched off, which shows that cathode rays consist of charged particles.
Related: Atomic Structure, Teltron Tube - Planar Diode, Tel-X-Ometer.
For a quotation on the Teltron Tube - Perrin, contact School Equipments India.
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