all screws to make sure that the cover is securely fastened to the unit.
Changing the AC and B+ Fuses
The B+ fuse for your amplifier is rated at 1.0A fast acting ceramic. There is also one primary mains fuse rated
at 6A Slo Blo (100/120Volt AC) or 3A Slo Blo (220/240 Volt AC) ceramic. The B+ fuse is housed in a holder
located on the back panel of the amplifier, and the mains fuse is housed in a separate holder also located on the
back panel of the unit. To change either fuse make sure the unit is powered off, and disconnect the AC power
cord from the unit. Move the amplifier so that you can work with the panel in the back. The type of fitting
used for both fuses is called a bayonet fit, which describes the action needed to remove the fuse cap. Locate
the appropriate fuse holder and to loosen it turn the screwhead approximately one quarter of a turn in a
counter-clockwise direction while pressing inwards. The fuse cap should spring out from its housing with the
fuse held inside the cap. Take the fuse out and replace it with a new one, and insert the fuse cap back into the
holder, pushing it downward while turning it in the clockwise direction to lock it in place.
WARNING: For continued protection against fire hazard only replace the fuse with the same type and
rating as was originally specified for the amplifier. If you have problems locating the correct fuse
contact your VTL dealer or the VTL factory service department.
Cleaning
Your VTL amplifier should be dusted occasionally with a damp non-abrasive cloth. You should not use any
solvents for cleaning the front panel, as this can damage the lettering and the finish. It is recommended that
you use a contact cleaner such as Pro-Gold on the input and output connectors regularly to ensure optimum
sound and proper signal conducting capability.
Transporting MB-125
If you should ever need to ship your amplifier and need help doing so then ask your VTL authorized dealer to
give you assistance in packing the unit into the cartons for the amplifiers. Your dealer should also be able to
arrange for new cartons to be sent to you and help you with the packing should you require it.
MB-125 Owner’s Manual
VTL
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