Compared to the Thunder Reverb, the Thunder Drive has an additional Crunch volume control, to give the guitarist access to all 3 channels. A very punchy 50W workhorse that uses a 12" Celestion Vintage 30 speaker. All-tube guitar amp, fully loaded with all key features. Next to its sonic qualities, the beauty of this amp is rooted in simplicity. With its uncluttered, sensibly arrayed control features, the Thunder makes it easy to dial in first-class sounds. The latest in a line of classy amps, the Engl Thunder delivers that unmistakable ENGL sound--warm, creamy and extremely dynamic tube tone. Quality components, excellent workmanship and strict quality control ensure high performance and durability.