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Teltron Maltese Cross Tube D
Teltron Maltese Cross Tube D (Product Code: SLE/PHY/307) is a high-vacuum electron tube used to show that electrons travel in straight lines, by casting the shadow of a Maltese cross onto a fluorescent screen, in college and senior school physics laboratories. Its divergent electron gun runs at up to 5 kV on the anode, and a magnetic field from Helmholtz coils lets students study electron optics such as beam focusing. A clear physics demonstration for cathode-ray lessons, it is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India.
Specifications
| Parameter | Detail |
|---|---|
| Tube type | High-vacuum electron tube with divergent electron gun |
| Screen | Fluorescent, partially obscured by a Maltese cross |
| Range | Teltron D range (connections fixed on the tube) |
| Brand | Teltron (third-party brand) |
| Anode current | Approx. 0.1 mA at 4 kV |
| Max. filament voltage | 6.3 V AC |
| Max. anode voltage | 5 kV |
| Documentation | Instructions included |
| Listed for use with | EHT power supply; Helmholtz coils for magnetic-field experiments |
| Product code | SLE/PHY/307 |
| Supplied by | Jain Scientific Equipments Pvt Ltd (ScienceLab), Ambala, India |
What Is the Maltese Cross Tube Used For?
With no electric or magnetic field applied, electrons from the divergent gun travel straight to the fluorescent screen, and the Maltese cross in their path leaves a sharp, cross-shaped shadow. That shadow is the evidence: just as light casts a shadow of an object, the electron stream travels in straight lines. It is one of the first observations students make when they meet cathode rays.
Next, bring in a magnetic field using Helmholtz coils. The shadow shifts and changes, showing that the beam is made of charged particles that respond to a field, and adjusting the field lets the class explore electron optics such as focusing the beam. Darken the room for the clearest image, keep the filament at or below 6.3 V AC and the anode at or below 5 kV, and let a teacher handle all high-voltage connections.
What to Specify When Ordering
- Whether you need the EHT power supply listed for this tube.
- Whether you already own a Teltron D-range holder and Helmholtz coils for the magnetic-field experiments.
- The number of tubes for your laboratory.
Supplier
Jain Scientific Equipments Private Limited, whose trading name is ScienceLab, supplies the Teltron Maltese Cross Tube D from Ambala, Haryana, India. Teltron is a third-party brand; we source the tube for physics departments in India and international markets and can combine it in one quotation with the supply and coils it works with. Visit our company profile for more about the company.
Related Physics Lab Equipment
Items for the same series of electron-beam demonstrations:
- EHT Power Supply — the high-voltage supply listed for use with this tube.
- Teltron Helmholtz Pair of Coils D — magnetic field source for D-range tubes.
- Teltron Tube Holder D — mounting for Teltron D-range tubes.
- Teltron Electron Deflection Tube D — follows on by bending the beam with electric and magnetic fields.
- Teltron Electron Diffraction Tube D — contrasts straight-line travel with the wave behaviour of electrons.
Find the full list in Physics Lab Equipment.
Frequently Asked Questions
What does the Teltron Maltese Cross Tube D demonstrate?
The Teltron Maltese Cross Tube D demonstrates that electrons travel in straight lines when no field is applied, by projecting the shadow of a Maltese cross onto a fluorescent screen. With Helmholtz coils it also shows electron-optics effects such as beam focusing.
What are the operating voltages of the Teltron Maltese Cross Tube D?
The Teltron Maltese Cross Tube D has a maximum filament voltage of 6.3 V AC and a maximum anode voltage of 5 kV, with an anode current of approximately 0.1 mA at 4 kV. Use a supply that stays within these limits.
Which power supply does the Teltron Maltese Cross Tube D need?
An EHT power supply is listed as the other equipment for use with the Teltron Maltese Cross Tube D. Tell us which supply your lab already owns and we will confirm whether it suits the tube before you order.
Can the Teltron Maltese Cross Tube D show magnetic effects?
Yes. Applying a magnetic field with Helmholtz coils to the Teltron Maltese Cross Tube D moves and reshapes the shadow, so students can study how a field acts on the electron beam and explore beam focusing.
Are instructions supplied with the Teltron Maltese Cross Tube D?
Yes, instructions are included with the Teltron Maltese Cross Tube D. They help the teacher set up the tube, connect the supplies safely and run the shadow and magnetic-field demonstrations with a class.
Who supplies the Teltron Maltese Cross Tube D?
The Teltron Maltese Cross Tube D is supplied by Jain Scientific Equipments Pvt Ltd (ScienceLab) of Ambala, India. Teltron is a third-party brand; ScienceLab does not manufacture the tube but sources it for institutions in India and international markets.
Request a Quote
For a quotation on the Teltron Maltese Cross Tube D and any accessories, contact us through our contact page or add it to the enquiry cart.
Last updated: 24 September 2026
