PreSonus TubePRE - Manual (Page 15)

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If the voltage on the back of my TubePRE does not match the
voltage listed on the power supply what do I do?
The voltage on the TubePRE’s external power supply may change. If
the power supply came factory sealed with the unit, then it is the right
power supply. If the power supply did not come with the unit it is
recommended that it not be used. If your power supply is damaged or
missing, please consult your salesperson or call Presonus.
Can I use a higher/lower/alternate voltage power supply that
was not supplied with my TubePRE?
Use of any power supply that was not included with the unit voids the
warranty of the TubePRE and may cause damage to the unit or the
user. It is strongly recommended that you refer any service issues to
Presonus.
Can the TubePRE be rack mounted?
Yes, please consult your local Presonus dealer or www.presonus.com
for rack mounting instructions and to locate the appropriate rack
mount adaptor.
Can I use a different size/style tube in the TubePRE?
The only tube that can be used in the TubePRE is a 12AX7. Any
variation can cause damage to the unit/user and voids the warranty.
Please refer to Section 3.5 of this manual for further directions on
changing the tube. It is strongly recommended that you refer any
service issues to Presonus or check our website at www.presonus.com.