BOGNER
AMPLIFICATION
4
speaker outputs
– back panel
You have the choice of 16, 8 or 4 ohm output impedance; please use the value which matches your
speaker cabinet. A speaker or other load must be hooked up before you turn the Atma on, otherwise you
risk damaging the output transformer. If you want to hook up two cabinets you need to get a splitter box
which gets hooked up to one of the three outputs, always just use one, never two or three outputs at the
same time. If you have two cabinets with the same impedance hooked up to a splitter box the single out
put with half the impedance value must be used. Example two 16 ohm cabinets connected to a splitter
box, the box gets connected to the 8 ohm speaker output only!
speaker cabinet
– not included with the head
The complimentary 1x12 open back speaker cabinet features an aluminum shell construction with a
screwed in Baltic birch baffle board. It comes loaded with a Celestion G12H30 at 16 ohms.
Troubleshooting
Make sure your read and understand the safety instructions!! Repairs should be done only by
knowledgeable Technicians!! Always make sure your Cables, Guitars, Effects and Extension Cabinets are
working and hooked up correctly. If you think something is wrong with your Amp, play straight into the
Amp with nothing else hooked up other than a Guitar. That way you make sure it is the Amp. If you own a
combo unplug the internal speaker and hook up an external speaker cabinet to make sure it's only the
amp which is faulty. For noise check the appropriate preamp tubes (refer to f). Tubes are delicate and
have a limited live span depending on operating time, temperature and mechanical influences. 99% of all
sound and noise problems come from preamp tube failure. W e let our amps run for at least two days
before we ship them to make sure that the tubes work properly but since they have glass housing and
delicate little plates inside them it happened that they got damaged during shipping. Please don't feel
discouraged. W e don't manufacture tubes and can only retest them to make sure they're okay.
Fuses
To check the fuses, use an Ohmmeter to make sure they're blown because sometimes you can't see if
they're blown. The Atma uses a 1A slow blow 5x20mm type as main fuses located in the power cable
socket on the back panel. Due to the small chassis the Atma has no H.T. fuse.
If the main fuse(s) blow(s) it could be just a voltage peak from your power outlet. Put a new one in and
see what happens. If it blows again please contact us.
There you have it! It's all up to you now, be creative and push your musical imagination…For Questions
call or visit out our website:
bogneramplification.com
