To the basic Bottlehead Crack 1.1 I added the Speedball 1.1 Upgrade. The Crack 1.1 uses 12AU triode tubes for input and output, and the stock tubes are included. High quality Kester 63/37 rosin core solder was used throughout. and M.S.) in electrical engineering and physics and in the early part of my career I spent some years doing mainly electrical work (electrical design, assembly, testing, and software design) in the research and development department of an instrumentation company in Sweden.I know electronics and can easily tell the difference between a good solder joint and a cold one. I just completed construction of this Crack 1.1 and it sounds super! While I wouldn't call myself a professional headphone amplifier builder, I have degrees (B.S. It also works very well with many Beyerdynamic and AKG headphones. A favorite of Sennheiser headphone aficionados, the Crack pairs extremely well with Sennheiser HD 600, HD 650, and HD 800 (or HD 800 S) headphones. The Crack is an output transformerless tube headphone amplifier designed for use with higher impedance (>200 ohms) headphones. I am offering for sale a newly completed Bottlehead Crack 1.1 OTL Headphone Amplifier with the Speedball 1.1 Upgrade.
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