BOGNER
AMPLIFICATION
3
power cable socket
– back panel
This socket connects the Atma to the main AC voltage, it is recommended to have the power switch in the
off, zero (0) position. Plug the supplied cable first into the amplifier and then into your wall AC socket.
Make sure your amplifier is made for the correct voltage of your location.
The power cable socket also has a little pull out fuse holder, it contains the main fuses. To pull the fuse
holder out you have to disconnect the power cable first, use a little screw driver to pull the holder out,
please note it does not detach from the socket. The holder comes with two fuses, the inner one is the
actual one used while the outer one is a spare.
power switch
– back panel
After connecting a speaker cabinet or other load and with the power cable connected you can turn the
power on, flip it from 0 to 1, the pilot light on the front will light up. Please note the Atma has no standby
switch. The EZ81 tube rectifier will raise the voltage very slowly and therefore will protect the tubes from
voltage peaks.
fx loop
– back panel
The Atma has a series effects loop between pre and power amp. Connect the send to the input of an
effect and the return to the output. The loop circuit is completely out of the audio path as long as nothing
is plugged into the return jack.
vintage/modern switch -
back panel
This switch is in the power amp circuit and lets you have either a wide open dynamic – vintage - or a
more dense and tight - modern – response usually preferred for higher gain rock tones.
power attenuator switch
– back panel
This switch gives you three power settings, in the middle position you have the full 18 watts for maximum
headroom. From there you have the choice to set it to 5 or 1 watt.
ft.sw. foot controller
– back panel
Plug here the foot controller in. You have two switches, the right one lets you switch from clean to
overdrive (led illuminated), the left one lets you switch between the solo and crunch (led illuminated)
channel. If you switch from the clean channel to the overdrive it will depend on the left switch which of the
two channels is on
cr gain
– back panel
Like already explained above the cr gain control lets you preset the crunch gain, which is the difference in
gain between the crunch and solo channel, with this control turned up all the way the crunch channel has
essentially identical gain as the solo channel, this is useful if you rather have channels with identical gain
but want two different switchable volume settings.
