PreSonus BlueTube DP - Manual (Page 12)

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3 . 4 S O M E T H O U G H T S O N V A C U U M T U B E S
The BLUETUBE DP comes supplied with a 12AX7 vacuum tube
that meets or exceeds the stated performance criteria for the unit.
We expect some owners of the BLUETUBE DP will try different
tubes to investigate the various performance possibilities they
might provide. Tube replacement can be easily accomplished by
first unplugging the unit from the electrical outlet and removing the
screws which attach the top to the chassis. The tube is mounted in
a transverse fashion and care should be taken to properly align the
pins on the tube to the corresponding holes in the receptacle.
Make sure the tube is completely seated in the receptacle and
replace the top of the unit before restoring power to it. Remember:
Tube life and performance are affected by how often a tube is used
and by how hard the tube is driven when in use. Signs of wear
may be exhibited by poor performance or by the tube becoming
“microphonic”. Periodic replacement of vacuum tubes is
recommended. The time between the suggested replacement
varies greatly with use. If you notice a deterioration in sound
quality then it’s time to change the tube.