Bottlehead Crack Schematic

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  1. Bottlehead Amp
  2. Bottlehead Crack Schematic 1
  3. Bottlehead Crack Kit

The Bottlehead Crack is a superb introduction into the world of DIY audio. The parts quality is very good, the documentation is truly excellent, the Bottlehead forums provide fantastic peer-to-peer assistance, and construction is very easy. The Bottlehead Crack is an outstanding first project for the novice audio DIYer. Skip the Crack if you're using these cans. Conclusion: As most reviews have stated, the Bottlehead Crack seems to be a DIY amp that has an almost symbiotic mind-meld with the Sennheiser HD 650s. I have also heard good things about the Crack and HD 800s, but I don't own those (yet) so I can't attest to these claims. I am in no way disappointed.

  • The third is three-quarters complete but they have provided a part which doesn't match the instructions or schematic. I have parts which I can use or do they want me to use the part provided. I have emailed them but it may be 24 before a response.
  • Welcome to Bottlehead. Here you will find vacuum tube based amplifier, preamplifier and headphone amplifier kits, speaker kits, finished high end tube audio products, reel to reel tape machine upgrades, parts, and one of the finest support communities on the web.
and woodworking disasters
3 years ago

This week's kit is the Bottlehead Crack OTL Headphone Amplifier. Unlike many vacuum tube designs, the Crack is relatively beginner friendly due to the included documentation and large user base. This amp is wired point-to-point as opposed to on a board.

  • the input tube is a 12AU7 and the output tube is a 6080 (6AS7); possible tube rolling in both positions

  • the output impedance of the amp is about 120 ohms (1/Gm of 6080), meaning it works best with high impedance headphones (120ohm+)

  • large electrolytic coupling caps mean you will not suffer from a high pass cutting your lows with low impedance headphones (though damping factor would be low)

  • CCS loads for the 12AU7 and 6080 (Speedball) is available as an optional upgrade

If you've built this amp, please share your thoughts! And for more vacuum tube reading, remember to also subscribe to /r/diytubes.

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Operating System:

  • Windows 8
  • Windows 10
  • Windows7
  • Windows 8.1
  • Windows XP

Bottlehead Crack Schematic 1

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