User Guide

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Mechanical Handling
Do not bend or force the metal pins coming out of the base of the tube. This could break the vacuum seal
and ruin the tube. The same is true of any sharp mechanical shock. You can usually tell if the seal breaks, as
the silver deposits that coat the inside of the glass will turn to a white powder.
For The Sake of Nostalgia
As a committed group of computer geeks and jazz music enthusiasts, we at AOpen believe that the
vacuum tube can satisfy the listener’s ear much more than the average AC’97 or a very expensive PCI sound
card. Yes, we understand that we’re dwarfed by the tube equipment giants in a number of ways, but with the
AX4B-533 Tube, we believe we’ve found a better way to get outside the box and really hear the music.
So let the tube glow and enjoy it!