The GH50L is a single channel master volume style head with footswitchable gain. It is capable of a huge variety of sounds, from sparkling clean through powerful crunch to full on monster tones and everything in between. If tone capable of turning people's heads at 100 yards is what you're after - look no further. As well as astounding tone these heads offer a valve-coupled effects loop and link jacks for slaving several heads together. The GH50L features an ECC83 equipped preamp and EL34 output section, easily switchable for 5881's. The GH50L is designed to be used with the GS412IA and GS412IS cabinets - to enhance the amplifiers huge tonal range and produce stunning tone at any volume.