Changing the AC and B+ Fuses
The B+ fuse for your amplifier is rated at 1A fast acting ceramic 600V. There is also one primary mains fuse
rated at 15A Slo Blo (120Volt AC), or 8A Slo Blo (220/240 Volt AC) ceramic. The B+ fuses are housed in
two holders 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 the fuses is called a bayonet fit, which describes the action needed to remove the fuse
cap. To remove the B+ fuse, locate the large fuse holder in the back of the amplifier and check to make sure
that the silkscreen indicates that this is the B+ fuse. Turn the fuse cap counter-clockwise to loosen the cap
holder until the holder can be removed easily and note that the B+ fuse will now come off with the cap. To
replace the B+ fuse, put a new fuse in the fuse cap and return the whole assembly back into the holder, making
sure that the fuse is securely lodged in the fuse cap. Install the fuse cap back into the fuse holder and turn it
until the cap is completely screwed back onto the fuse holder. Check to make sure that there are no more
threads left on the fuse holder, and that the connection is absolutely tight.
To change the Mains fuse, use a flat blade screw driver to loosen the fuse cap. Note that the fuse will also
come out with the fuse cap. To re-install the mains fuse, 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 ST-150
If you should ever need to ship your amplifier, pack the unit with the original carton and foam. Contact your
VTL dealer or the VTL factory if you need replacement packing material.
ST-150 Owner’s Manual
VTL
13
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