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Control elements
7
Footswitch
Footswitch BUGERA FSB104
The 7-pin 36 DIN connector is provided to connect
the footswitch cable (included). Then, the cable is
connected to the FOOTSW(itch) connector of the
BUGERA amplier. Be sure to make a connection
before switching on the amplier.
The 37 CLEAN switch activates the CLEAN channel. Its
LED illuminates when the channel is active.
The 38 CRUNCH switch activates the CRUNCH chan-
nel. Its LED illuminates when the channel is active.
The 39 LEAD switch activates the LEAD channel. Its
LED illuminates when the channel is active.
The 40 FX LOOP switch activates the FX LOOP and the
BOOST function. Its LED illuminates when the FX
LOOP is active.
Inside the BUGERA
DANGER!
*
High voltage! Risk of death!
High voltages of up to 500 V DC may be
present inside the casing for long periods
after being disconnected from the mains.
To avoid lethal electric shock, do not open
the casing. There are no user-serviceable
components inside. Refer all maintenance
to qualied service personnel. Remove the
mains cable when the unit is not in use.
The parts inside the amplier operate at
*
high voltages and high temperatures. To
avoid damage and injury that results from
re or electric shock, do not drop or spill
anything into the unit’s casing.
Instructions for qualied service
personnel only
Remove the backside of the amplier’s casing to get to
the valves and the control elements.
These are the sockets for the 41 12AX7A/B/C pre-
amp valves.
These are the sockets for the 42 6L6 and EL34 power
amp valves. Please take care that the BIAS SELECT-
switch (43) is set correctly. The models 333 and
333-212 are supplied with 6L6GC power amp valves
when it leaves the factory. The models 333XL and
333XL-212 incorporate EL34 power amp valves.
The 43 BIAS SELECT switch allows the amplier to
optimally adapt to the used valves (6L6 or EL34).
*
The 44 BIAS TEST connector lets you connect a volt-
meter in order to measure the power amp valves
(bias adjustment). Make sure that the voltmeter is
set to direct current (DC).
The 45 BIAS ADJUST control is used to make the bi-
as-adjustment.
Replacing the power amp valves also requires
$
bias adjustment. You should always use sets
of four matched valves. The valves of the
BUGERA Series are ideal for this purpose.
Inside the BUGERA 333