Vacuum Amp from Gakken
If you are not satisfied with the quality of sound that your iPods or other portable audio devices offer, this Vacuum Amp from Gakken can offer a solution.
You can create your kit yourself in just 30 minutes to enjoy the kind of sound that you have been yearning for long. The Vacuum Amp brings real vintage vacuum tubes into use that were made more than 30 years ago! You can easily connect your computer, iPod, radio tuner, or other audio devices to it with ease. What’s more, you may even insert normal straws of varying lengths in the rear of the speakers to create and experiment with different sound quality.
With a size of 7.9 x 2.8 x 5.5” and weight of 1100 g, this device gives an output of 100 mW / ch.
It costs $233.