Up for sale is a mint condition, fully assembled Bottlehead Crack with the 1.1 Speedball upgrade. It has a Dale stepped attenuator installed along with Tung Sol 5998 power tube and Mullard CV4003 input tube. Also included is an audioquest Big Sur 3.5 mm to RCA input for the amplifier. A Pangea heavy duty power cord is also included, along with two RCA 6080 tubes. Amp functions perfectly with no microphonics or issues . I simply decided that I only like fully portable audio and don't like being tied to a desktop.