Bogner Duende Amp - Owner's Manual

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1. Uniquely versatile 6V6 design with inspiring features:

• Footswitchable two channel All- Tube design. Channels can be COMBINED or used separately via footswitch, or manually at the back of the amp
• Ch. a : Gain (Pull Bright), Treble, Bass and Volume plus shared Master EQ controls
• Ch. b : Gain, Volume (Pull Bright) plus shared Master EQ controls
• Master EQ Section : Air (Post EQ Treble) and Body (Post EQ Bass) controls, these are shared between both channels
• Tube Reverb with long Accutronics tank with independent level controls for each channel
• Tube-buffered series FX- Loop
• Footswitchalbe Photo-Cell based Tremolo with Speed and Depth (Pull On) controls
• Power Amp Line Out with high cut filter
• Power Amp Filter Switch: Mordern (Tight) and Swamp (Loose)
• 5AR4 or 5Y3 Tube Rectifier
• 12-15 Watt 6V6 Power Amp Section
• Functions on footswitch: channel switch, channel combine and tremolo on/off
• Available as Head or Open 1x12 Combo

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.

Head: 11 1/2" H x 24 1/2" W x 10 1/2" D 30pounds
1x12 Combo: 23" H x 24 1/2" W x 10 1/2" D 42pounds
 

2. How to use it:

Read this owners manual completely before use to fully understand your Duendes functions.

a) Master EQ

The "air" control acts as overall treble and the "body" as overall bass control. These are shared by both channels. Set both of them to 12 o'clock as a starting point.

b) Bright Function

Both channels have a bright function which is engaged by pulling the "gain a" for channel a, the "volume b" for channel b.

c) Effects Loop

This is a none bypass able tube buffered series effects loop between pre- and power amp. The "send" connects to your effects input and the "return" to your effects output. This loop is designed to work with instrument level pedals. Line level effect units that feature in- and output level or at least one of those controls should work just fine as well.

d) Reverb

The reverb is not bypass able. Each channel has its own control but if booth channels are engaged at the same time without the footswitch connected, "reverb a" control is the only one working. If the footswitch is connected, the reverb control working when both channels are engaged depends on how the channel select , a v b right side, is set. If set to a , reverb a - , if set to b, reverb b control is working.

e) Power Amp Filter Switch

This switch gives you the choice of different filtering settings for the power amp. Set to "modern" gives you a tighter more focused sound. The "swamp" position is looser and has more sag (there is a slight hum in this mode due to the weak filtering)

f) Footswitch

Your amp comes with a 3 button footswitch.One button is for switching between the two channels (a v b, right side), one for engageing both channels at the same time
(a + b, left side) and one for the tremolo ( center). The footswitch jacks are located on the back panel. The top one is labled"trem/rev", the bottom one "ch select". The stereo (ring,ring, tip) 1/4" plug goes in the "ch/select" jack. The mono 1/4" plug (ring,tip) goes into the "trem/rev" jack. If you don't know the difference between mono and stereo plugs look at them and you will notice the difference (Mono=tip,ring and Stereo=tip,ring,ring). The 3-position rotary switch on the back panel is only active when the footswitch is not plugged in. This rotary switch allows you to activate either: Position 1 = channel a or position 2 = channel b or position 3= channel a+b. The tremolo can also be engaged without the footswitch plugged in by pulling the "depth" control. Please note, the tremolo needs to be turned off on the amp when the footswitch is used, otherwise it is always on and can not be turned off viathe footswitch.

 

3. Tubes

Your Duende comes with a 5AR4 (15W) or 5Y3 (12W) rectifier tube ( V8 ) and a pair of Tesla or other brand 6V6 ( V6 and V7 ) poweramp tubes depending on availability.
Five 12AX7A tubes are used in the pre amp, see tube chart for individual functions.

Note: If you want to experiment with different tubes the first 3 tubes are the most noticeable ones, soundwise. The less gain the tube has and the earlier the tube is in the sound chain (V1, V2,..) the less noisy your amp is.

Make sure you turn your amp off when you switch tubes and be careful, the tubes might be very hot!! Do not touch tube sockets with fingers? Even after turning your amp off and unplugging it from the power outlet there could be enough voltage stored in the capacitors to give you a lethal electrical shock.

4. Speakers

The 1x12" combos are loaded with a 8 ohm Celestion G12H30 speaker.

Subject to change, depending on availability on Speakers.

5. Fuses

To check the fuses, use an Ohmmeter to make sure they're blown because sometimes you can't see if they are. The Duende has two main fuses, type: 5x20mm slow blow, both of them need to be good in order for the amp to work. They are located between the power cable connector and the power switch. To release the fuse holder you need to push the top and bottom latch with your finger nails towards each other and pull the insert out. If you can't get it out this way, use a little screw driver and pull first one, then the other latch, the insert snaps out and you be able to pull it out. For 100-120 volt models a 1.5A fuse should be used (3A for 220-240 volt). The HT fuse is a "3AG Slow Blow" screw-cap type and should be 1/4 A on all models. The HT fuse blows usually if your power amp tubes are bad to protect the circuit from getting damaged. If the Main fuse blows it could be just a voltage peak from your power outlet. Put a new one in and see what happens. If it blows again give us a call.
Radio Shack carries both type of fuses..

6. 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. We 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 a glass housing and delicate little plates inside them it happened that they got damaged during shipping. Please don't feel discouraged. We don't manufacture tubes and can only retest them to make sure they're okay.

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