This amp is an update on the original AC4 tube amp from the 60's. It's got killer tone and all-tube power that isunmistakablyVox.What really makes this little amp stand out is the adjustable powerattenuator. What this feature provides is the ability to drive your tubes as hard as you want while still maintaining low volumes so as not to disturb those around you. You can choose from full 4-watt output down to 1-watt and even 1/4-watt settings. All retain the same tube tone and characteristics while lowering your volume to neighbor-friendly levels.Plus it's got an external speaker output to drive your favorite cab and it weighs less than 20 lbs - carry it anywhere!