Bogner ATMA Bedienungsanleitung

BOGNER AMPLIFICATION

ATMA USER MANUAL

Please read safety instructions before you use this amplifier!!!

Features:

•2xEL84 18WClass A cathode biased power amp

•EZ81 tube rectifier

•2xJJ ECC83s preamp

•JJ 5751 phase inverter

•Ch1: clean with volume and tone control, 3 position bright switch

•Ch2: crunch with gain preset (back panel) and volume control

•Ch3: solo with volume control

•Ch2+3 share gain, bass, middle and treble control, 3 position voicing switch

•Series effects loop

•Single instrument input

•Power attenuator switch for 1 and 5 watt operation

•16, 8 and 4 ohm speaker outputs

•Functions on footswitch: Crunch (solo) and Overdrive (clean)

•Head only, complementary aluminum speaker cabinet

•All aluminum chassis with unique aesthetics

DIMENSIONS and WEIGHTS: Are subject to change anytime, Please measure your amp carefully if a

Custom Case is being made. Add ¾ inch for each, handle and rubber feet.

The head has two screws on each side to secure the aluminum top shell, please note theyneed

clearance on each side!

Head: 6.25”H12.62”W6.50” D14 pounds

1x12 Cabinet: 17”H17” W10.50” D31 pounds

Please read this owner manual completely before use to fully understand your Atma’s functions.

input

The Atma has a single high impedance input located on the front panel.

cl/cr/so toggle switch

This switch lets you select one of the three channels if no foot controller is connected. The front panel

display lets you know which controls are active. Whatever control is illuminated at a certain channel

setting can be used to alter the sound.

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60/70/80 toggle switch

This3position switch works on the crunch and solo channel and will give you the option to find theright

gain structure for guitar, pickups and musical style.

60 -produces lower gain plexi and bassman tones, you have to set the gain high for overdriven sounds

otherwise the amp stays pretty clean which of course gives you the option to use it as a second clean

channel as well. This voicing works good in combination with high volume settings for dynamic cranked

power-amp overdrive.

70 -bumps up the gain and slightly narrows the frequency spectrum to give you a more focused high gin

sound

80 -has the most gain, due to the high compression the volume get cut and needs to be readjusted. This

mode is also good for very low volumes.

gain control

Thiscontrolsets the amount of gain for the crunch and solo channel.

Important! Located on the back panel you find the cr gain control, this one 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.

tone control

This control attenuates the tone and gain characteristics of the clean channel. A lot of thought has been

put into the design to have a very flexible clean channel with just a tone-, volume control and a bright

switch. Best to start out with it set half way and see it as a neutral position, from there if you turn down

you will get less gain with more highs and bass for the typical scooped blackface sound, turning the

control up will add gain and midrange growl reminiscent of the classic tweed tone.

bass, middle and treble controls

Let you control the bass, middle and high frequencies of the crunch and solo channel.

volume controls

These controls let you set the loudness of each channel independently from each other.

bright switch

This switch lets you choose a dark, neutral or bright position and works for the clean channel only. Note

the higher the clean volume is set the less effective the switch becomes.

power indicator light

This light indicates that the amp is powered on, it is also sensitive to the input level and will flash along

with your strumming dynamics.

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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 attenuatorswitch –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.

BOGNER AMPLIFICATION

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

Makesure your read and understand the safetyinstructions!! Repairsshouldbe done only by

knowledgeableTechnicians!! Always makesure your Cables, Guitars, Effects and Extension Cabinets are

workingand hooked up correctly.If you think something iswrong withyour Amp, playstraight intothe

Ampwithnothing elsehookedup other than aGuitar.That wayyou makesureitis the Amp. If you owna

combo unplug the internal speaker and hook up an external speaker cabinet tomakesureit's onlythe

ampwhichis faulty.For noisecheck the appropriatepreamptubes (refer to f).Tubes aredelicate and

havealimited livespan depending on operating time, temperatureand mechanical influences.99% of all

sound and noiseproblemscomefrom preamptube failure. Welet our amps run for at leasttwodays

beforeweshipthem to makesurethat the tubes workproperlybut sincetheyhaveglass housing and

delicate littleplates inside them ithappened that theygot damaged during shipping. Pleasedon't feel

discouraged. Wedon't manufacturetubes and can onlyretestthem to makesurethey'reokay.

Fuses

Tocheck the fuses,usean Ohmmeter to makesurethey'reblown becausesometimes you can't see if

they'reblown.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 mainfuse(s) blow(s) itcouldbe justavoltage peak fromyour power outlet. Put anewone in and

see what happens.If itblowsagainplease 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

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