Double Fine Beam Tube

Part evacuated electron tube, filled with neon at low pressure and tangential and axial electron gun. For determining specific charge e/m from the diameter of the filament beam in the case of tangential bombardment and a perpendicularly aligned magnetic field, and observing spiral paths of electrons in the case of axial bombardment and a co-axial magnetic field.

The electron paths are rendered visible in the form of fine luminescent beams through impact excitation of the neon atoms.

Max. filament voltage: 7.5 V AC/DC

Anode voltage: 120-300V DC

Max. anode current: < 30 mA

Max. deflection voltage: 50 V DC

Glass bulb: approx. 130 mm diam.

Total length: approx. 260 mm