Making its debut from Seymour Duncan is the SFX-04 Twin Tube Mayhem, a high gain guitar preamp. According to Gearwire, the SFX-04 uses twin sub-miniature USA-made Phillips Sylvania 6205 vacuum tubes to achieve a heavy sound that screams pure metal.
Here's an excerpt from the Seymour Duncan Press Release:
“The new-old-stock, USA-made Phillips Sylvania 6205s represent the pinnacle of tube technology. They were designed and manufactured to meet the U.S. Governments MIL-E-1 spec for reliability under conditions of severe shock, vibration, and temperature. They provide extremely long service life and exhibit virtually no tendency toward microphonics.”
“High-quality vacuum tubes are only part of the key to a great-sounding tube preamp. Too often, inexpensive tube gear runs in starved plate mode, where the tubes function like clipping diodes and do not actually amplify. The Twin Tube Mayhem employs a fully encapsulated, toroidal transformer to achieve the high plate voltage required for true tube amplification and 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, the smoothest tone, and the low-order harmonics one expects from a great tube preamp.”
Specs:
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 oclock
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: 100K?
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 11 W
External Dimensions 7.50 X 6.62 X 1.96 (190mm X 168mm X 50mm)
Weight 3.15 lbs. (1.43KG)
[VIA] Gearwire
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