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off/on. One of the two switches activates
Gain Boost
. Plugging a footswitch into this jack disables onboard channel (15)
switching and
Gain Boost
Note also: A footswitch may be equipped with LEDs indicating the given switching
status. Each of the two switches is provided with approx. 10 milliamperes current,
which suffices to power a standard LED. The jack's mono terminal selects Channel 1 or
Channel 2, while the stereo terminal controls the Gain Boost feature (for pin
assignments,
see page 21
25 Power Tube V8 Fuse
A fuse in the rear chamber of this fuse drawer protects the V8 power tube. It is
designed to blow in the event of an electrical problem with tube V8. The Power Tube
Fuse LED (28) lights up to indicate that one or several of the four fuses has blown.
There is a replacement fuse in the front chamber of the fuse drawer.
CAUTION: Switching off the amp and pull the mains plug before opening the fuse
drawer!
Need-to-know info:
have the same ratings as the original fuse! See section 28 for some more key facts
about tube defects.
26 Power Tube V7 Fuse
A fuse in the rear chamber of this fuse drawer protects the V7 power tube. It is
designed to blow in the event of an electrical problem with tube V7. The Power Tube
Fuse LED (28) lights up to indicate that one or several of the four fuses has blown.
There is a replacement fuse in the front chamber of the fuse drawer.
CAUTION: Switching off the amp and pull the mains plug before opening the fuse
drawer!
Need-to-know info:
have the same ratings as the original fuse! See section 28 for some more key facts
about tube defects.
27 Master B
Master B volume knob. Located post FX Loop, it gives you an alternative to the Master
A knob (16). In another words, you can set a different power amp output level and
then activate this Master B volume via footswitch. If you wish to switch between
Master A and Master B, you have to connect an ENGL Z-9 Custom Foot Controller to
the S.A.C. Port (21) or footswitch such as the ENGL to jack no. 23. Two options for
controlling Master A/B via the Z-9 are described on page 10. You'll find tips on how to
make the most of Master A/B switching in section 16 on
28 Power Tube Fuse LED
This LED lights up to indicate one of the fuses in the fuse drawer (see the descriptions
under 25, 26, 33, 34) has blown to protect the power tubes.
Need-to-know info:
power tube fuse to blow. Normally this power tube is defective and needs to be
swapped for a new tube. The best way to tell if the defect is permanent is to replace
the fuse before installing a new power tube.
12
(14).
).
Always make sure replacement fuses are of the same type and
Always make sure replacement fuses are of the same type and
As a rule, it is an electrical problem with the tube that causes a
Channel 1
or
Channel 2
page 8 & 9
; the other engages
.
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