
248 Rock Hill Drive, P.O. Box 760 Rock Hill, NY 12775
Phone/Fax 845-796-3616
Seymour
Duncan Twin Tube Mayhem SFX-04
High-quality guitar preamp with built in boost

Application
High-quality guitar preamp with built in boost. Uses a duet of premium, mil-spec,
subminiature, USA-made Phillips-Sylvania 62051 pentode tubes. Great for old school metal, new
metal, thrash, death and doom.
Description
The high plate voltage and 100% vacuum tube signal path allow the tubes to operate at their
fullest potential and provide maximum dynamic range. Additional gain is achieved with a high
voltage, low noise, discrete Class A input stage. The solid state input stage increases the
resistance of the stomp-box to microphonics. The result is maximum dynamic range, the most gain,
and the heaviest tone your expect from a great tube preamp voiced for metal. Also features
user-selectable 4dB or 8dB boost for pre-setting rhythm and lead levels. True bypass. Fully
encapsulated toroidal transformer for quiet operation. Heavy duty steel chassis.
$229.95
Includes UPS Ground Shipping
in Continental U.S.
Temporarily out of stock
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Specifications
Gain
- Before Level Compensation – 97 dB
- After Level Compensation – 71 dB
*Gain measured at 1 KHz
Nominal Output Level – 0.25 Vrms (-10dBu)
*Nom. Output level measured with 100mV 1 KHz input signal and all controls set to 12
o'clock
Max. output level before clipping – 5 Vrms (16dBu)
*Max. output measured with gain set at 50% and all other controls set full up and
boost footswitch set to 8dB
Input Impedance: 100KOhm
THD @ 100mV RMS output – .5%
Noise @ Output – 4mV (< 3dB hum content)
Boost Footswitch Gain
- Two selectable boosts, 4dB and 8dB. No effect on tone, just increased level.
Active Equalization Section:
- Bass Control: 126 Hz, Q = 1.5, Gain = +/-12dB
- Midrange Control: 596 Hz / 1389 Hz, Q = 1.5, Gain = +/-12dB
- Treble Control: 2.93 KHz, Q = 1.4, Gain = +/-12dB
Power Consumption – 11W
External Dimensions – 7.50°± X 6.62°± X 1.96°± (190mm X 168mm X 50mm)
Weight – 3.15 lbs. (1.43KG)
Click here for manual |
$229.95
Includes UPS Ground Shipping
in Continental U.S.
Temporarily out of stock

Questions?
Call or e-mail steve@stevesmusiccenter.com.
Prices quoted are subject to change. Quantities may be limited on some items. If you plan to order more than one of this item, please
contact us before ordering to verify availability. Click HERE for Return Policy. |

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