PreSonus DigiTUBE - Manual (Page 12)

2 CONTROLS & OPERATION
10
2.3 VACUUM TUBES
The DigiTUBE comes supplied with a 12AX7 vacuum tube that provides excel-
lent performance characteristics. We encourage owners of the DigiTUBE to try
different brands of 12AX7 vacuum tubes to investigate the various performance
possibilities they might provide.
2.3.1 REPLACING THE VACUUM TUBE
1. Disconnect the DigiTUBE from it’s electrical outlet.
2. Remove the six screws that attach the top of the unit’s chassis. The vacuum
tube is mounted in a horizontal fashion in the middle of the DigiTUBE’s body.
3. Carefully remove the vacuum tube from it’s receptacle. Be sure to hold the
socket in place while gently wiggling the vacuum tube out.
4. Insert the replacement vacuum tube into the receptacle. Care should be
taken to properly align the pins on the vacuum tube to the corresponding holes
in the receptacle. (Caution should also be taken to not break the circuitboard.)
5. Replace the top of the DigiTUBE.
6. Restore power to the unit and resume operation.
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 the vacuum tube is recommended. The time interval for tube
replacement may vary greatly. If you notice deterioration in sound quality then
it’s probably time to change the vacuum tube.
2.4 POWER SUPPLY
This unit is supplied with an external power supply designed to operate at the
required voltage of the country where the retail sale occurred. Use of a power
supply other than one supplied with the unit constitutes an infringement of the
warranty and effectively voids it. Use of an improper power supply may damage
the unit and could pose serious danger of electrical shock or fire.