Lascells Ruben’s Tube-A truly exciting way to show the effect of sound waves in action, the Ruben’s Tube really brings the topic to life in a way students will never forget. The robust stainless steel welded construction means trouble-free operation for many many years. The unit is shipped with full instructions and safety guidance and is the perfect companion to the Digital Signal Generator. Dimensions: 1000 x 100 x 90mm Mass: 2.4kg Requires a supply of bench or bottled gas .Ruben’s Tube Amplifier. This is a small amplifier that attaches directly to the Lascells Ruben’s Tube. It comes complete with 9V power supply and 3.5mm connection cable. It allows music from MP3 players, iPods and computers to be played adding an extra twist to Ruben’s Tube demonstrations.