Wiring The Bugera - Bugera 1990 User Manual

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BUGERA 1990 User Manual

Wiring the BUGERA

! !
CAUTION!
Hot! Risk of injury! During use, the valves will get very hot and high
surface temperatures may be reached at the rear of this unit. To avoid
burning yourself, make all connections while the unit is still cold.
! !
ATTENTION!
TO AVOID DAMAGE TO YOUR AMP, NEVER USE THE BUGERA VALVE
AMPLIFIER WITHOUT A LOUDSPEAKER CONNECTED!
The BUGERA amplifier has two paralleled LOUDSPEAKER outputs which are used
to connect one or two speaker cabinets.
If you only connect one speaker cabinet, be sure that the IMPEDANCE switch is set
to match the impedance of the connected cabinet.
If you want to connect two speaker cabinets, both cabinets should have to the
same impedance. Be sure to have set the IMPEDANCE switch correctly. In this
case, set it to half the value of one of the cabinets. When using two 16-Ohm
cabinets, the switch therefore needs to be set to 8 Ohms; and with two 8-Ohm
cabinets, set it to the minimum impedance of 4 Ohms.
When you use two speaker boxes with differing impedance values, the speaker
with the lower impedance will provide the highest output power. In this case the
IMPEDANCE switch must be set to half the value of the speaker with the lower
impedance value. Example: 16 ohms + 8 ohms -> 4 ohms.
bugera-amps.com
Speaker cabinets
1 x 16
1 x 8
1 x 4
2 x 16
2 x 8
Impedances
BUGERA 1990
Loudspeaker
output
Speaker cabinet BUGERA 412H-BK
Connecting a speaker
IMPEDANCE switch
16 8 4