![]() ![]() Bottlehead is an established maker of high-end amplifiers, including vacuum tube-based, headphone, and preamps located in Bainbridge Island, WA. The Speedball upgrade is a Camille Cascode Constant Current Source upgrade for the Crack - replacing the 22k1 ohm plate loads of the 12AU7 with C4S load, as well as the 3K ohm cathode load resistors of the 6080 triodes. Sennheiser HD 580 / HD 600 / HD 650 / HD 800 Beyerdynamic DT 770 / DT 880 / DT 990), generating approximately 300mW of output power. This output transformerless amplifier is perfect for high impedance headphones above 250 ohms, (e.g. This is the Crack that was used to write the assuembly manual, and was fitted with the original Speedball board (note the different color and humorous text on the PCB). This is in excellent condition and has traveled with the Bottlehead team to headphone shows. Two additional old stock 12AU7 tubes will be included if purchased at the Buy-It-Now price. Included with the amplifier is a power cord, Tung Sol 6AS7G, and GE 5814. Bottlehead Crack OTL Headphone Amplifier w/Speedball Upgrade For sale is a built-by-designer, Bottlehead Crack OTL headphone amplifier with Speedball upgrade.
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