UBERSCHALL USER MANUAL
Please read
safety instructions before operating this amplifier!
The
Bogner Uberschall features a Classic clean channel with
volume, gain, bass, middle, treble and presence controls.
Pound all your pedal effects into this channel, the harder
you hit it the more it smiles to show you its fangs. Seems
pretty innocent huh? Just wait... we then unleash mayhem
with the Five-Mega Ton SUPER AGGRESSIVE high gain channel
with gain, bass, middle, treble, volume and presence
controls. You think you've heard BASS before, no way,
the UBERSCHALL will shatter your rib-cage, you better put
911 on speed dial! Even with extreme gain and volume this
channel stays massively focused and resists mushing out from
the heaviest right-hand attack. Have some other crazy
effects? Put them through the Tube buffered effects loop.
Power comes from a throaty EL34 output section.
Go ahead,
try and hide from the UBERSCHALL it will seek you out,
relentlessly, while you sleep, in this life and the next...
But all will soon embrace the UBERSCHALL and we will wonder
how anyone tried to play Standard tuning, 7 String or
Dropped low tuning guitar without it...Through Anarchy comes
Peace.
1. Features:
- Two channel all
tube design with Fiber optic backlight
- Global Master
Volume
- Each channel has
Independent: Volume, Gain, Bass, Treble, Middle, &
Presence controls
- Tube buffered
effects loop with mute switch
- Line-Out jack
- Foot switchable
channel switching and effects loop mute (footswitch
included)
- 120 Watt EL34
Tube Power Amp Section
- Available as Head
DIMENSIONS and
WEIGHTS: Are subject to change anytime, Please measure
your amp carefully if a Custom Case is being made. All
measurements include handle and rubber feet. Weights include
our shipping box and packaging.
Head: 10 5/8" height x
27" width x 11 7/8" depth, 53 pounds
2. Before you turn
the amp on: O.K. we know most of you are too excited to
read the entire manual before you start playing your new
baby UBERSCHALL, so we wanted to give you a pretty good
starting point for the tone and gain controls. Plug in a
speaker! You should refer to the Speaker Outputs
section below prior to playing and as always, experiment!
but please completely read this owners manual ASAP. Also,
note that you will have to turn the Clean channel volume up
quite a bit higher to match the output of the High-Gain
channel, this is normal. Here we go…
- Far left "Global
Master Volume": 9 o'clock
Clean Channel:
- Volume: 5
o'clock
- Presence: 5
o'clock
- Treble: 5
o'clock
- Middle: 5
o'clock
- Bass: 11
o'clock (be very careful with this one, not too
much)
- Gain: 3
o'clock
High Gain Channel:
- Volume: 1
o'clock
- Presence: 1
o'clock
- Treble: 1
o'clock
- Middle: 1
o'clock
- Bass: 1
o'clock (be very careful with this one, not too
much)
- Gain: 1
o'clock
3. Input: The
UBERSCHALL has a single instrument input, you can alternate
between both channels via the footswitch or channel "select"
button on the back panel.
4. Controls:
Master volume is global, meaning it controls the overall
volume of the amp. Each channel has independent volume and
gain as well as tone controls. This allows complete
flexibility by allowing you to dial your tone on each
channel and then turning the overall amp volume up or down
depending on your needs.
The Clean channel is
very straight forward, it has great headroom that loves to
be pummeled by effects pedals. The Bass, Treble, Middle, &
Presence tone controls are interactive and allow a wide
range of colors to be served up. If your desire is to
maintain the most clean headroom, keep the gain down and
turn up the channel volume. If you like a little more grit
in your clean tone turn up the gain knob to find the sweet
spot and then adjust the channel volume. Experiment to find
the best balance for your needs.
The High-gain channel
is capable of EXTREME GAIN and BASS response. We designed
this channel to sound massive and to stay tight and focused
even at extreme gain and high volume levels. One of the most
unique items is our "Presence" control. It's an amazing
combination of a midrange-presence control. As you sweep
through its range you will notice an incredible variety of
tones this one control allows. For an extremely aggressive
sub-harmonic bass and scooped-midrange sound, keep the
presence off or very low. A huge 3-dimensional tone can be
found by running the presence around 2 o'clock. Pushing the
"Presence" control to maximum will allow you to cut a sonic
path through the mix by reinforcing your midrange and
slightly rolling off the sub-bass. Trust us: REALLY check
out the presence control to unleash the hidden secrets of
the UBERSCHALL. The "Midrange" control is very interactive
with all the other tone controls, you can go from a hollow
scooped-mid setting to an aggressive in your face and on
your throat kind of intensity. The "Bass" control allows
almost a sub-harmonic low-end to be added, at high volumes
be sure to keep the bass down a bit to keep your tone
focused like a laser beam.
5. Effects loop:
Note! Make sure the loop is Off (FX button on chassis
is "out" or Off on the footswitch) when no effects are being
used. Or your amp will not make a sound. See changes below
for Uberschalls made after 8/16/04. The UBERSCHALL
features a tube-buffered effects loop that can be muted via
the footswitch or the "FX" switch on the back panel. When
muted, the instrument signal routes through the rest of the
UBERSCHALL circuit but the effects that are in the loop are
not heard.
6. Line Out jack:
We have offered a padded down (lower output) non-equalized
power-amp line out.
7. Speaker Outputs,
Impedance Selector: Two Speaker Outputs have been
provided, one primary, that should always be used first,
and the other for a second speaker cabinet. You must
match the Impedance Selector exactly to your Speaker
cabinet's impedance. Failing to do this can harm your tone,
speakers or void your BOGNER warranty. Ask for professional
advice if you don't know your Speakers impedance. When using
multiple speaker cabinets refer to the back panel Speaker
chart for the proper Impedance Selector position.
*** Uberschall
changes implemented after 8/16/04, Adjustable Loop send and
Volume Cut function, Bias Test Points, Uberschall Power Amp
Mod::
We have added a
potentiometer for the effects loop send level, this gives
two benefits.
Adjustable Loop
send. First, this allows you to optimize the effect
loops send level into your effect units input, this can
prevent overloading of the effect units input and allows you
to use a wide range of effect units.
Volume Cut
function. Second benefit. When no effect unit is plugged
in the loop, the pot can be used as an adjustable "boost in
reverse". Here's how to use this function as a boost, make
sure no effect unit is in the loop: Turn the effect loop on
and then turn DOWN the effect loop send control on the back
panel to adjust your "normal" non-boosted volume level. When
you turn the effects loop OFF the amp will get louder,
instant boost! Perfect for solos! Once your happy with the
ratio of boost to non-boost, then you can adjust the Global
master volume on the front panel to determine your overall
maximum volume level.
Service Technician
Emergency Bias test points: We have added individual
tube Bias test points for use by Service technicians only.
We use and recommend the more accurate and detailed
Scope/Signal Generator method of bias adjustment in addition
to these test points. Note: Many non-professional
Multimeters are are not accurately calibrated and suffer
from a high degree of error tolerance. This feature was
added for Service Techs to provide a "quick initial test".
Common or ground plug
insert is White color and the four individual tube plug
inserts are Blue color. Set your multimeter to mV setting,
1mV = 1mA reading. Connect your multimeters ground test lead
to the White/Common insert and the multimeters postive test
lead to one Blue/Tube insert. Adjust Bias to 25 mA, +/- 2 or
3 mA. Matched tubes may have +/- 5% tolerences.
Uberschall Power
Amp Mod:
The Uberschall now
features on amps made after 8/16/04 a muted power amp when
no input is plugged into the front input jack. If you wish
to use the power amp portion of the Uberschall with another
preamp you must do the following: Plug in a "dummy input
jack" into the front panel input to activate the circuit.
Turn the effects loop on. Select the "dirty" or high gain
channel. Now you can use the Global Master volume for your
level and also the Presence control on the high gain channel
becomes active as well.
