BOTTLEHEAD CRACK MANUAL MANUAL
) The manual didn't tell me to do this, but I used some clip leads to attach my volt meter to the supply rail to monitor the voltage when I turned the Crack on for the first time. White wire has been a properly used convention in the kit elsewhere for the left channel. It says: 'Cut a 2 inch piece of red wire.' I used white wire as it appears to be part of the left channel connection between the plate of the 12AU7 and the grid of the 6080. I would add 'Insert the #8 slotted screw' as there are a couple of #8 screws that might get confused. It says: 'Insert a #8 screw through the hole.' I suggest you gently squeeze the tabs together when inserting this switch to reduce the stress on the tabs during installation. Unfortunately, the plastic is a little brittle and one of the mounting tabs broke. ) When inserting the power switch, I just pressed it into place. ) Desoldering braid (Solder Wick) and socket wrenches are listed as optional tools. I found no outright errors in the build instructions, but I do have a couple of notes. Not really a problem, though, as I had more than a foot of each color wire remaining when done. Wire lengths specified were all just slightly long, which is good just in case you cut the conductor while stripping by mistake. It included a picture and a clear explanation for every step. Just great fun! The step-by-step instructions made construction a breeze.The manual for the kit comes in.pdf form on a CD, and I found it to be thorough and extremely detailed. And expert DIYers will experience a delightful walk in the audio park.
BOTTLEHEAD CRACK MANUAL UPGRADE
Because it's so simple, the Crack is the perfect platform for novice DIYers to play around with and listen to the sound changing as various upgrade parts are explored. After that, it'll be 'game on' for further upgrades, tweaks, and tube rolling.
BOTTLEHEAD CRACK MANUAL INSTALL
Once measured, I'll install the Speedball, and then measure again. I've got the kit, but won't be installing it until I've put the Crack through the full measurement routine. It really doesn't get much simpler than this.Additionally available is the Speedball upgrade kit ($125), which is a constant current source for the plate circuit of the 6080. (I'd suggest 300 Ohms and up, but some will find it fine for cans down to 100 Ohms.) The power supply is a simple unregulated supply, with a full-wave solid-state diode bridge rectifier, and a C-R-C-R-C supply filter.
The output is capacitively coupled (the only cap in the audio path), and has an output impedance of about 120 Ohms making it an amp suited mainly for higher impedance headphones. This sweet little OTL amp never fails to impress.It uses a 12AU7A as its input stage, and a 6080 in a cathode follower configuration as its output stage.
Bottlehead Crack OTL DIY Headphone Amp ($279)Over the years, I've stopped by the Bottlehead booth at shows to say 'Hi!' Numerous times, and each time I make a special point to have a listen to the Bottlehead Crack.
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