Duncan Twin Tube Blue SFX-11 User Manual Download Page 2

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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 Blue. Most of this is 

common sense, but please read it anyway.

Your Twin Tube Blue 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 Blue into any other type of power system. Contact your facilities manager 

or a qualified electrician if you are not sure what type of power is supplied 

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

amplifiers 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 fire 

or electric shock. 

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

Blue 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 Blue. Wouldn’t that 

suck? Refer all servicing to qualified service personnel.

Do not block or cover the side vents on your Twin Tube Blue. 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 fire, electric shock, or damage to your Twin Tube 

Blue. 

Never place a Twin Tube Blue near a radiator or heat register. Failure to follow 

these guidelines can cause overheating and affect the reliability of your Twin 

Tube Blue.

Unplug your Twin Tube Blue 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 Blue 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 Blue to dripping or splashing liquids and do not place objects 

filled with liquid on or near your Twin Tube Blue (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.

Summary of Contents for Twin Tube Blue SFX-11

Page 1: ...Twin Tube Blue right away after reading the safety precautions below and you ll immediately enjoy the versatility of having two channels of gain and a wide range of great tones However you might want...

Page 2: ...ich could result in serious injury or death not to mention damage to the Twin Tube Blue Wouldn t that suck Refer all servicing to qualified service personnel Do not block or cover the side vents on yo...

Page 3: ...great tube preamp Tube Life The 6111 tubes will typically last many times longer than even the best 12AX7s For most Twin Tube Blue owners this means you ll never have to change your tubes However not...

Page 4: ...Status Indicator When lit it indicates that the Lead Channel is active or staged for activation if the unit is bypassed 6 Lead Volume Master volume control for Lead Channel Positioned at the end of t...

Page 5: ...e Note it is a 16 VAC 600mA unit Do not try to substitute a DC power supply or another AC supply with a different voltage value or current rating If you lose your transformer or if it breaks contact a...

Page 6: ...ipping diode and do not actually amplify Though starved plate voltage is used in some inexpensive tube stomp boxes it is not true tube amplification The circuitry in the Twin Tube Blue enables the tub...

Page 7: ...d activates the Lead Channel As with the Rhythm Channel start rotating the knobs clockwise until the desired volume level and distortion are achieved relative to the Rhythm Channel and to the bypassed...

Page 8: ...uitar and tubes You can push it just hard enough to break up while most of your notes are clean and clear Memphis Boogie Dirty blues will hit your amp hard if you ve got the chops This will dirty up y...

Page 9: ...tube amp territory No additional overdrive pedal needed with this setting There s enough gain on tap for searing leads and loads of sustain Searing lead strat is a registered trademark of fmic with w...

Page 10: ...produce sound 5 Press the On Bypass button to activate the Rhythm Channel Turn the Gain control up about half way Slowly turn the Master Volume up as you pluck a string Fine tune the Gain setting to a...

Page 11: ...ad channel 98dB After level compensation Rhythm channel 52dB Lead channel 76dB Gain measured at 500Hz Nominal output level Rhythm channel 0 4 Vrms 5dBu Lead channel 0 5 Vrms 4dBu Nom output level meas...

Page 12: ...your USA dealer international distributor or sent direct to our factory postage prepaid along with dated proof of purchase e g original store receipt and a RMA number clearly written on the outside o...

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