Seymour Duncan Twin Tube Mayhem User Manual

For Tone That Sets You Apart

Congratulations on your purchase of the Seymour Duncan Twin Tube Mayhem™. You can start using your Twin Tube Mayhem right away after reading the safety

precautions below, and you’ll immediately enjoy the monstrous tone and unmatched

feel of pure high gain all tube distortion. However, you might want to read through

these instructions in their entirety rst, to gain valuable information, which will enhance your enjoyment of your Twin Tube Mayhem.

Safety Precautions

Hazardous voltages are present. For your protection, and to reduce the risk of electric shock and danger to personal health, please observe the following safety precautions when setting up and using your Twin Tube Mayhem. Most of this is common sense, but please read it anyway.

Your Twin Tube Mayhem is designed to work with typical power systems utilizing a three-prong outlet. To reduce the risk of electric shock, do not plug your Twin Tube Mayhem into any other type of power system. Contact your facilities

manager or a qualied electrician if you are not sure what type of power is

supplied to your building or performance stage. Do not use your Twin Tube

Mayhem with ampliers or other gear that have two prong AC plugs. Do not

overload wall outlets, extension cords, or multiple power strips as this can

result in a risk of re or electric shock.

Never open the chassis. Do not attempt to tamper with or service your Twin Tube

Mayhem yourself. You’re just asking for trouble. Opening or removing the cover

may expose you to dangerous voltage or other hazards, which could result in

serious injury or death – not to mention damage to the Twin Tube Mayhem. Wouldn’t that suck? Refer all servicing to qualied service personnel.

Do not block or cover the side vents on your Twin Tube Mayhem. Never push

objects of any kind through openings in the equipment. No drummer jokes, please. Dangerous voltages may be present. Conductive foreign objects could produce a short circuit that could cause re, electric shock, or damage to your

Twin Tube Mayhem.

Never place a Twin Tube Mayhem near a radiator or heat register. Failure to follow these guidelines can cause overheating and affect the reliability of your Twin Tube Mayhem.

Unplug your Twin Tube Mayhem from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning.

Do not use your Twin Tube Mayhem near water - for example, near a bathtub, washbowl, kitchen sink, or laundry tub; in a wet basement; near a swimming pool; on stage with water effects or precipitation; and the like. Do not expose

the Twin Tube Mayhem to dripping or splashing liquids and do not place objects lled with liquid on or near your Twin Tube Mayhem (yes, unfortunately, this includes bottled malt beverage liquids). And for heaven sakes, don’t use it while you’re sitting on the can… OK, enough of that.

General Information

The Twin Tube Mayhem is designed for years of solid performance. One of the

secrets is the duo of type 6205 tubes. These sub-miniature pentodes represent the pinnacle of tube technology advancement. The 6205s were designed and manufactured to meet the MIL-E-1 spec for reliability under conditions of severe shock, vibration and temperature. They provide extremely long service life with

virtually no tendency towards microphonics (see USA Department of Defense Standards, Test Methods for Electron Tubes). Also, unlike some “tube” stomp

boxes that only use a tube as a clipping diode; the Twin Tube Mayhem employs a vacuum tube signal path with a high voltage power supply, coupled with a

high voltage, low noise, discrete Class A input stage. This allows the tubes to

operate at their fullest potential, and provides the greatest amount of tube gain and tone. The result is the authentic tube sound and feel, aggressive distortion, and low order harmonics you expect from the best tube amps.

Two levels of Boost mean versatility. When coupled with (true) bypass, this effectively provides three-channels: Rhythm, Lead Boost, and bypass. The Boost

level selector allows you to preset the amount of boost ready when you hit the switch. The meticulous internal layout minimizes cross coupling and unwanted circuit interactions that can be a major problem in high gain-high impedance vacuum tube circuits.

Tube Life

The 6205 tubes will typically last many times longer than even the best

12AX7s. For most Twin Tube Mayhem owners, this means you’ll never have to change your tubes. However, nothing lasts forever. Should you nd your Twin Tube Mayhem in need of new tubes (e.g., exhibiting erratically uctuating signal levels, spurious increases in noise, sputtering, low level

whistling, extreme loss in frequency response), contact Seymour Duncan or your favorite authorized Seymour Duncan dealer for your options.

try changing the tubes yourself

is more complicated than plugging pins into a socket and could be dangerous. Make sure a professional does the work.

Do not

. Changing tubes on the Twin Tube Mayhem

Explanation of Controls

Top Panel

1. Gain – Inter-stage gain control for the Twin Tube Mayhem. Provides varying

degrees of overdrive and saturation with enough on tap to fully saturate whether

you’re using the quietest single coil or the loudest active humbuckers.

2. Treble control - Center frequency – 3 KHz, Q – 1.4, Gain = +/-12dB

6 7 8 9

12 3 4

3. Midrange control

3a. User selectable center frequency – 600Hz or 1.4KHz, Q – 1.5, Gain = +/-12dB 3b. Allows you to select low-mid or high-mid frequency

4. Bass control – Center frequency – 125 Hz, Q – 1.5, Gain = +/-12dB

5. Volume – Master volume control for the Mayhem. Positioned at the end

of the gain chain, it regulates the loudness relative to the bypassed sound.

6. On/Bypass button – Selects between true bypass and the Twin Tube Mayhem.

7. Active/Bypass status indicator – When lit, it indicates that the Twin Tube

Mayhem is engaged and operational. When dark, it indicates that the unit is in bypass mode and that the guitar signal is passing straight through unaltered.

8. Boosted status indicator – When lit, it indicates that the Boost function is engaged and operational.

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