REVV G50 MK3 - Page 7

REVV | GENERATOR G50 MK3 REVV | GENERATOR G50 MK3
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CABINET LIGHTING
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The cabinet lighting jack on the rear of the amplifier
is used to connect the amp to Revv speaker cabinets.
Because the Revv badge on our cabinets lights up, you
can illuminate the cab badge with this jack.
Simply use the 4 pin Din cable provided with all Revv
cabinets and connect the amplifier to the cab lighting
connector on the cabinet.
FOOT SWITCH CONNECTION
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This connection both powers your footswitch & allows
it to control your Revv. Should the provided footswitch
cable fail, any 5 PIN DIN cable can be used.
Note: This cable sends important data between the
amplifier and the footswitch. If a lesser quality 5 PIN
DIN cable is used, incorrect or erratic behavior could
occur. A high quality cable is recommended, which can
be provided by Revv should you need a replacement.
MIDI CONNECTIONS
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The MIDI IN connection is for external equipment
connections when your rig necessitates control of your
Revv with third-party gear.
The MIDI through jack allows for the connection of
additional MIDI devices in your signal chain in addition
to your Revv.
See MIDI Section of this manual for more details.
IMPEDANCE & SPEAKER JACKS
30
The amplifier must always be connected to a speaker
cabinet or load when it is powered up and set to
have the internal load disengaged. This amplifier can
be used with cabinets that provide a load of 4, 8 &
16 ohms. Because the amplifier provides a number
of speaker jacks with dierent impedance options, it
can also power 2 cabinets directly from the amplifier.
The speaker jacks must be used correctly for the
impedance to be matched between your amp and the
cabinets being connected.
Most setups are simple, one cabinet plugged into
the amp, select the impedance to that marked on the
cabinet & you’re ready to go! However, when it comes
to adding more cabinets to the rig, more care must be
taken to prevent damage. Most rigs will not utilize more
than 2 cabinets, so we won’t go beyond 2 cabinets here.
Some examples:
• Two 8 ohm cabinets would be plugged into the two
4 ohm speaker jacks (one per 8 ohm cab) located
on the back of the amplifier.
• Two 16 ohm cabinets would be plugged into the
two 8 ohm speaker jacks (one per 16 ohm cab)
located on the back of the amplifier.
• Two 4 ohm cabinets cannot be run in parallel with
this amplifier. This will cause damage.
Warning: Using more than one speaker impedance
at a time will result in damage to the amplifier. For
example, if 2 speaker cabinets are connected to the
8 ohm speaker jacks on the back of the amplifier, the
remaining speaker jacks (4 ohm and 16 ohm) must not
be used or connected to any other cabinets.
Note: No damage will result when running the amplifier
set at a lower impedance (Ex: 4 ohms) into a cabinet
rated at a higher impedance (Ex: 8 Ohms). However the
opposite will cause damage to the output transformer
or other components & it is suggested that the amplifier
never be run into a lower load.
TUBES &
BIASING
POWER TUBES
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This amplifier is designed around 6L6 and EL34 tubes but
will accept many octal tubes (EXCLUDING 6V6) & gladly
display their tonal characteristics for you in your Revv.
EL34
The EL34 tubes are more aggressive than the KT88,
they add more harmonic content & have a bit more
sizzle on the highs. Can impart a slightly “British”
classic flavor.
6L6GC
The 6L6GC tube is big, open & articulate. It’s also
known as the American tone in power tubes.
Note: The tubes listed above are guaranteed to bias
correctly & sound good in the amplifier, but if you
are an experienced technician other tubes can be
experimented with as well. 6550, KT77, KT66, 5881 can
be equipped, with care.
PREAMP TUBES
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This amplifier uses 12AX7 (ECC83) preamp tubes in the
preamp of your amplifier. Preamp tubes do not need
to be biased & usually have a long life unlike power
tubes, but a preamp tube can become faulty at any
stage of its rated lifespan.
POWER TUBE BIAS
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You will need a voltmeter or digital multimeter set to
the lowest DC voltage range. (Make sure you refer to
the meter’s user manual).
Note: Use tubes that are matched! .
To prepare:
1. Remove the rear bae cover from the rear of the
amplifier. If you are replacing tubes, do so now with
the power o & the amplifier unplugged from the
main power receptacle. Place the new tubes in the
correct socket positions.
2. Turn the trimmers down by turning the trim pot
with a small screwdriver in the counterclockwise
direction. You can access the trim pots through the
small holes in between the power tube pairs. If any
fuses had blown, make sure to replace them as well.
3. Now plug the amplifier into the main power
receptacle, unplug any guitar cables from the
inputs & turn on the main power. Let the tubes
warm up for one minute
4. Turn down the master volume controls to zero &
turn on standby to the ON position.
5. Verify that none of the tube fault LEDs are on. If
they are, power down the amplifier, remove the
plug from the main power receptacle & replace the
faulty fuse & return to step 3. If everything checks
out, move on to the next steps of setting the bias.
If it is still blowing fuses, a tube is at fault. Try a
dierent pair.
SETTING THE BIAS
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1. Place the black lead from your meter into the black bias
test point on the amplifier & the red lead into the red
bias test point.
2. Refer to the chart below for bias set points for the
tubes being used & slowly turn the trimmer in the
clockwise direction until the value is reached.
3. Now let the amplifier sit powered for 5 minutes. We
want the tubes to reach their maximum operating
temperature. Keep an eye on the bias reading
during this time.
4. Re-check the settings of each bias test point &
make any further adjustments as required.
5. Once the bias is set at the required settings, return