User manual

ManualsBrandsMojave ManualsMusical Instrument AmplifierDirty Boy

WARNING: Please read ALL the safety and other instructions contained

inside this User Manual BEFORE your first use of the product. Failure to

do so may result in serious personal injury or death and/or permanent

damage to the product. Keep these instructions for future reference.

The lightning flash with arrowhead symbol, within an equilateral triangle, is

intended to alert the user to presence of uninsulated “dangerous voltage”

within the product’s enclosure that may be of sufficient magnitude to

constitute a risk of electric to persons.

The exclamation point, within an equilateral triangle, is intended to alert the

user to the presence of important operation maintenance (servicing)

instruction in literature accompanying the appliance.

WARNING: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT

REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,

DO NOT EXPOSE THE APPLIANCE TO RAIN OR MOISTURE.

NOTICE: Operation is subject to the following two conditions: (1) This device may not

cause harmful interference, and (2) this device must accept any interference received,

including interference that may cause undesired operation.

Dirty Boy User Manual

Summary of content (15 pages)

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Dirty Boy User Manual WARNING: Please read ALL the safety and other instructions contained inside this User Manual BEFORE your first use of the product. Failure to do so may result in serious personal injury or death and/or permanent damage to the product. Keep these instructions for future reference.
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Dirty Boy User Manual Thank you for your purchase of the Dirty Boy, handcrafted by Mojave Ampworks LLC. Your new Dirty Boy amp comes with the following: 1. 2. 3. 4. 5. Power Cord Owners Manual Registration information Boost on/off Pedal (Optional) Boost Pedal Cable (Optional) Overview: We are very pleased to offer the Dirty Boy for your musical enjoyment. The Dirty Boy amp is truly a one of kind amplifier and likely very different from most any amp you have ever played.
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Dirty Boy User Manual successive pre-amp tube is installed in the corresponding socket moving from right to left (i.e., V2 in the 2nd socket, V3 in the 3rd socket, etc.) Step 4: Once all the pre-amp tubes are installed, install a metal cap over each of the preamp tubes. To install a cap, carefully line-up the tab on the tube socket with the corresponding gap on the metal cap. Once aligned, carefully push the metal cap over the tube, depressing the spring inside the cap.
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Dirty Boy User Manual 4. Turning the Dirty Boy ON: Once the Variac and the Bias controls are set to “0” and COLD, move the power switch on the front of your Dirty Boy to the “ON” position. Allow at least sixty (60) seconds for warm up, which is the minimum recommended. Note that longer warm up allows the tubes to stabilize. If you have the luxury of allowing your amp to warm up for 5 minutes, this would be optimal.
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Dirty Boy User Manual should be kept in mind as the Variac does not provide power to any part of the amplifier other then the power section of the amplifier. The heaters for all the tubes, including the power tubes, are all provided on an auxiliary basis. This means you do not have to worry about under powered heater voltage on your tubes in the Dirty Boy. The heater voltage on the 5U4 power tubes is also provided separately from the Variac and allows the rectifiers to operate at the correct temperature. 3.
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Dirty Boy User Manual the “cut off” state of the power tubes. You are going to hear a “gating” effect. I would invite you to experiment with this feature. If you set the guitar volume and boost to the levels necessary, you will literally blow through this “cut off” state and get a full blown power tube distortion. There is a fast response to this “cut off” state that no other amp can provide you. The reason is simple; your going to hear sound so long as your making strong notes.
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Dirty Boy User Manual SECTION 3: Dirty Boy Amp’s Features and Functions. 1. Variac Dial Control. This controls the power level of the overall amp. When the Variac control is set to 100%, the power amp section of the amp is able to produce 100 watts of power. Setting the Variac at lower then 100% will yield lower power levels at the power amp section. See Understanding the Variac above to learn more about Variac functions. 2. Guitar Input. This is the single input for your instrument.
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Dirty Boy User Manual and music as well as instrument signal. When the feedback control is set to minimum, the amp will behave with a stronger degree of punch and brightness. When the Feedback control is set to maximum, the amp will be dampened down to allow a better clarity and less aggressive tone. The Feedback control can help shape your sound and feel of your sound. 14.Bias. The Bias control can make drastic changes to your amplifier’s sound.
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Dirty Boy User Manual connection at one time. If using a set of cabinets, the two cabinets will plug to the output jacks but will equal only 1/2 of the impedance of either one cab. For example, two 16 ohm cabinets will equal 8 ohms if plugged into both speaker output jacks. This is known as parallel. 24. Speaker Impedance Selector. Use this switch to select the correct speaker impedance of the cabinet to which you are connecting.
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Dirty Boy User Manual Many users like to experiment by changing their tubes with different brands to hear alternative tone qualities. It is recommended that any tube changes be done only if necessary and by a qualified or authorized facility. The Dirty Boy has a user adjustable Bias control which is set at the factory to provide a window of variable bias for the tubes, which were installed at the time the amp is built and equipped with tubes. You can change the preamp tubes without any need for assistance.
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Dirty Boy User Manual SECTION 7: Frequently Asked Questions. 1. Can I change the power tubes to another type or brand? No, if the power tubes are changed they will need to be re biased. Biasing procedure for the Dirty Boy is unique since this amp is run on a variac and there is a user adjustable bias control on the front. We STRONGLY recommend you contact us for any tube changes if so needed. The Dirty Boy cannot use any other type of tube other then the EL34 model tube. 2.
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Dirty Boy User Manual SECTION 8: Quick Start Amp Settings: Clean Tone: • Variac 82% • Boost off • Guitar Volume 30% • Treble 80% • Midrange 57.5% • Bass 67.5% • Presence 85% • Feedback 50% • Bias 65% • Telecaster Dirty Rhythm: • Variac 90% • Boost Off • Guitar Volume 85% • Treble 100% • Midrange 97.5% • Bass12.
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Dirty Boy User Manual Tone Type: Hair Pick (Chewing On Crayons) • Variac setting: 70% • Boost Gain:87.5% • Deep On/Off: On • Boost On/Off: On • Boost Volume: 94% • Guitar Volume:100% • Treble:75% • Midrange: 35% • Bass 0% • Presence 50% • Feedback 77.
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Dirty Boy User Manual Guitar: Mahogany Strat with Floyd Rose Bridge 7 Tom Holmes 455 Bridge Pick Up Tone Type: VHII Beautiful Girls • Variac setting: 74% • Boost Gain: 65% • Deep On/Off: Off • Boost Volume: 100% • Boost On/Off: On • Guitar Volume: 100% • Treble: 74% • Midrange: 100% • Bass: 20% • Presence: 75% • Feedback: Min • Bias: 64% Guitar: Carvin SH550 Semi Hollow Stock Pickups Tone Type: Sound Clip Dirty Boy Dirty Rhythm Sound • Variac setting: 90% • Boost Gain: 0% • Deep On/Off: Off • Boost Volume:
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Dirty Boy User Manual Guitar: Carvin SH 550 Semi Hollow Stock Pickups (Single Coil tap selected) SYTF Tone Type: Clean with good articulation, slightly bright but still balanced. • Variac setting:100% • Boost Gain: 0% • Deep On/Off: Off • Boost Volume: 0% • Guitar Volume: 20% • Treble: 100% • Midrange: 35% • Bass 40% • Presence: 95% • Feedback: Maximum • Bias: Hot (100%) For sound demonstrations check mojaveampworks.