Inside the BUGERA 333

Footswitch

Footswitch BUGERA FSB104

36The 7-pin DIN connector is provided to connect the footswitch cable (included). Then, the cable is connected to the FOOTSW(itch) connector of the

BUGERA amplifier. Be sure to make a connection before switching on the amplifier.

37The CLEAN switch activates the CLEAN channel. Its LED illuminates when the channel is active.

38The CRUNCH switch activates the CRUNCH chan- nel. Its LED illuminates when the channel is active.

39The LEAD switch activates the LEAD channel. Its LED illuminates when the channel is active.

40The 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 qualified service personnel. Remove the mains cable when the unit is not in use.

The parts inside the amplifier operate at **high voltages and high temperatures. To avoid damage and injury that results from fire or electric shock, do not drop or spill

anything into the unit’s casing.

Instructions for qualified service

en

personnel only

 

Remove the backside of the amplifier’s casing to get to the valves and the control elements.

41These are the sockets for the 12AX7A/B/C pre- amp valves.

42These are the sockets for the 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.

43The BIAS SELECT switch allows the amplifier to optimally adapt to the used valves (6L6 or EL34).

**

44The 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).

45The 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.

Control elements

7