Wyred 4 Sound mPRE - Manual (Page 6)

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AC Mains Voltage switch
Located on the left side of the rear panel is an AC mains switch. When
changing the 2 position slider switch the mPRE will need to be unplugged and
powered down for at least 2 minutes. It is very important to ensure that the slide
switch is in the proper position before applying power. Failure to do so will likely
result in damaging the internal components and will not be covered under
warranty.
The fuse is located above the IEC plug on the rear of the unit. It can be
inspected by sliding the fuse holder out. (It has a symbol of a fuse on it)
Fuse size 5x20mm Slow Blow / T2.5A 250VAC
Powering your Pre-amp
In order to power up the mPRE, the switch located on the rear must be in the
“on” position. After a couple of seconds, the green light surrounding the power
button on the front will illuminate. There is a built in 2 second delay after initially
turning the switch on in the rear of the unit before you can press the power button.
Pressing the power button will turn the unit on and the light around the power
button will switch to blue. It is only necessary to turn the Pre-amp off with the
switch on the rear when you are experiencing electrical storms in the area, or
perhaps leaving town for a long duration. To prevent power surges, we recommend
using quality surge suppression equipment. Turning the switch “off” on the rear of
the unit will protect it for when you have doubts on power stability.
“Break-in” period
The mini-PRE will perform very well right out of the box. You will experience
improvements as it reaches the normal operating temperature and once all of the
components have a chance to “settle in”. Our experience has shown that the mPRE
will improve during its’ initial 300 hours of music playback. After the first 100 hours
of music playback, (not just being powered on) the unit will start to shed any initial
“brightness” and slightly harsh transitions. During the second 100 hours, the mPRE
will start to become more fluid, and smoother overall. The remaining 100 will result
in much finer improvements.