Teltron Dual Beam Tube. The dual beam tube can be used to determine the specific charge e/m from the diameter of the path followed by electrons fired into the tube from perpendicularly mounted gun with vertically aligned magnetic field and observation of the spiral path followed by electrons fired axially into coaxial magnetic field.The dual beam tube is partly evacuated electron tube, filled with helium at low pressure and equipped with both axial and perpendicular electron guns. The electron beams are perpendicular to one another and common deflector plate is provided for both guns. The electron beam source is an oxide cathode heated indirectly via heating coil.The electron paths show up as fine, slightly greenish beam due to impact excitation of the helium atoms. Requires 300 or 500 DC power supply.• Filament voltage: max. 7.5 AC/DC• Anode voltage: max. 100 DC• Anode current: max. 30 mA• Deflector voltage: max. 50 DC• Glass bulb: 130 mm dia. approx.• Total length: 260 mm approx.
