Balanced Audio REX II Preamplifier User Manual
Page 5
5
In its standard configuration the REX II 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 REX II 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.
NOTE: There are TWO Current Sources in REX II, located in the Power Module.
The REX II X-PAK accessory includes two current source boards.
In order to change the tube type the user needs to remove the installed Current Source boards, and replace
them with either another type, 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.