Balanced Audio Technology VK-33SE, Руководство пользователя

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Vacuum Tube Current Sources in VK-33SE
Your VK-33SE incorporates a unique feature that allows you to optimize its sound to tailor it to your
individual taste or system requirements.
The Vacuum Tube current sources incorporated in the VK-33SE, being part of the signal gain stage, have a
direct effect on the unit’s sound. Changing the tube type used in that circuit allows the user an extra degree
of control over the sound of the unit.
In its standard configuration the VK-33SE current sources use the Russian 6C19 tubes. That tube is
basically a miniature version of the famous 6C33 tube, and provides, in our view, the best combination of
sonic characteristics and electrical performance.
However, the unique design of the VK-33SE allows you to also use other tube types in that application.
Currently, the user has the following three choices for vacuum tube Current Sources:
1. The standard 6C19 tube current source as installed from the factory.
2. The 6H30 SuperTube current source which requires the purchase of the X-PAK accessory.
3. The 5881 tube current source.
In order to change the tube type the user needs to remove the installed Current Source board, and replace it
with either another board, designed for a particular tube type, or install the 5881 tubes as a direct plug-in.
Only the 5881 tubes can be used directly upon the removal of the 6C19 current source board.