The seventh pedal released by Seymour Duncan is a guitar preamp for rock and heavy guitar players who want all the power from the tube sound. The Seymour Duncan SFX-04 Twin Tube Mayhem will get you a smooth but powerful tube sound with the highest quality components like Class A solid state input stage for additional gain.
The Seymour Duncan SFX-04 Twin Tube Mayhem Preamp features 2 Phillips Sylvania 6205 tubes, 3-band EQ with high and low mid switch, gain and level controls, 4 or 8 dB switchable boost, on/off and boost LED, true bypass and silent switch that eliminates switch noises.
This pedal has a heavy-duty nickel chassis and is powered with the included 16-volts AC adapter. The Seymour Duncan SFX-04 Twin Tube Mayhem Guitar Preamp price and availability has to be announced yet.
- From Gearwire
- Official site







I can’t wait to try one of these. I have the TT classic and it sounds great! Im sure this will sound bone crushing.
There are some units available in eBay for $230, but it’s not available in any store yet.