Find Reviews and Compare Prices for:       All ProductsGuitar Effects     5.0 (1)   Add a review Seymour Duncan SFX-04 Twin Tube Mayhem Distortion Guitar Effects Pedal...   The Seymour Duncan SFX-04 Twin Tube Mayhem is a distortion pedal with a high-quality guitar preamp that includes a built-in boost. Using a duo of premium, mil-spec, subminiature, USA-made Phillips-Sylvania 62051 pentode tubes, the Seymour Duncan ... Have a question? Just Ask! Member Reviews Compare Prices Product Spec Send to a friend Searched Seymour Duncan SFX-04 Twin Tube Mayhem Distortion tar Effects Pedal in 150 stores, 0 results found Sorry - We couldn't find any stores offering this product. Please check again. Image Description   Store   Price You can also search these stores   Find this product on Amazon   Amazon.com   2 Store Reviews   Search on Amazon   Find this product on eBay   eBay   0 Store Reviews   Search on eBay Are we missing a store? Let us know! Something wrong in this page? Let us know! Related products: More Overdrive, Distortion, Fuzz & Boost Guitar Effects Other Guitar Effects internal use: spec24 spec275 spec584