Kustom Defender V50 Owner's Manual - page 12
The Defender 112 Combo Back Panel
1) Power Cord Receptacle/Fuse Holder: Insert the AC cord (pro-
vided) firmly into the AC connector. NOTE: Replace the AC power
cord if protective jacket is damaged or ground pin is damaged or
removed. The fuse is located in a housing just below the receptacle.
Replace only with same type and size. To remove the fuse, remove
AC power cord and pull out on the tab above the fuse symbol locat-
ed on the fuse carriage. Place the new fuse in the carriage clip and
re-insert. NOTE: To prevent an electrical hazard, DO NOT replace
fuse without using the fuse carriage. Replace the fuse carriage if lost
or damaged before re-inserting the AC power cord.
2) Footswitch: The Footswitch jack on The Defender is a mono jack
that connects a footswitch to the amplifier. The footswitch switches
the Boost feature on and off.
3) Tube Chart
a. Bias Switch: The Defender ships from the factory with classic
EL34 output tubes. However, if you happen to prefer 6L6s or just
want to try something different, this amp has the ability. Under-
neath the tube cage is a switch that may be used to change the bias
to accommodate either EL34 or 6L6 power tubes. (Note: This switch
is not a user serviceable item. Be sure to take it to a qualified service
tech to make these changes.)
b. EL34 Output Tubes: These power tubes were selected to provide
the best combination of performance and tube life, and shouldn’t
require adjustment to their bias. The amp uses a mixed-bias sys-
tem, which is a combination of fixed and self-bias techniques to
give the user the best of both worlds. The result is that the amp will
control its own bias to a certain point, but without the typical reduc-
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