Revv Owner’s Manual - 28
Note: Use tubes that are matched! If 2 different tube types are being
used, make sure they are matched pairs. If all 4 are the same type, make
sure they are matched pairs at the very least (and don’t mix them up),
although a matched quad is better.
To prepare:
1)
Remove the rear baffle cover from the rear of the amplifier. If you are
replacing tubes, do so now with the power off & the amplifier unplugged
from the main power receptacle. Place the new tubes in the correct
socket positions.
2)
Next unlock the bias trimmers by turning the nut counter clockwise &
then turn the trimmers down by turning the trimmer shaft with a small
screwdriver in the counterclockwise direction. If any fuses had blown,
make sure to replace them as well.
3)
Now plug the amplifier into the main power receptacle, make sure the
amplifier is plugged into a load or speaker cabinet, 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 Revv 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 different pair.
