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Control elements
7
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 QUALIFIED
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 32 12AX7A/B/C pre-
amp valves.
These are the sockets for the 33 6L6 and EL34 power
amp valves. Please take care that the BIAS SE-
LECT switch (34) is set correctly. The BUGERA amp
is supplied with 6L6GC power amp valves when it
leaves the factory.
The 34 BIAS SELECT switch allows the amplier to
optimally adapt to the used valves (6L6 or EL34).
*
The 35 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 36 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.
CAUTION: WE HIGHLY RECOMMEND THAT
!
BIAS ADJUSTMENTS BE CARRIED OUT BY
QUALIFIED PERSONNEL!
Inside the BUGERA 6260