Electro-Harmonix tubes feature innovative designs and are of superior quality. Numerous OEMs utilize relabeled Electro-Harmonix vacuum tubes in their amplifiers. If you're in search of excellent-sounding tubes at an affordable price, then Electro-Harmonix tubes are a must-consider. Additionally, you can connect the Super Black pedal directly into the return jack of your amplifier's FX loop. By doing so, you bypass the amplifier's preamp, obtaining the sound of a complete Blackface amp signal path, devoid of your amp's preamp coloration.