Balanced Audio VK-55SE - Manual (Page 6)

Replacing Fuses:
WARNING: Please turn the unit OFF and disconnect the power cord before
proceeding.
There are three fuses in the VK-55SE. The main Slow-Blow fuse (10A rating for 110-
120VAC line voltage and 5A for the 200-240VAC range) is located on the unit’s back
panel.
The two 3A Fast-Acting protection fuses are mounted on the VK-55SE printed circuit
board and can be acsessed through the holes in the amplifier top plate.
If the pilot LED on the front panel goes out, try replacing the main fuse on the back panel
with the same type fuse.
If one or more of the autobias LED’s has gone out, turn the unit off and wait for few
minutes before proceeding, allowing the internal electrical charge to Remove and replace
the blown fuse with the 3A Fast-Acting type.
In either case, if the unit still fails to operate properly, please contact the factory for
professional service.
Factory supplied fuses should only be replaced with the same type and rating parts.
Replacing Output Tubes:
To maintain the optimal performance of your unit, replace the 6C33C-B output tubes
only with matched sets available from Balanced Audio Technology. If only one tube
fails, then just one pair needs to be replaced.
Please do not substitute any random tube as a replacement. Although the automatic
bias circuit in the VK-55SE will accept virtually any random set of output tubes, the unit
will not be guaranteed to meet all of its performance specifications under such
conditions. Finally, the determination that a single tube replacement is prudent rests
solely with the customer, based on actual hours of use for the particular set of tubes. The
factory assumes no responsibility for possible performance decrease under such
conditions.