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Crack;Bottlehead OTL

Discussion in 'Headphone Amps (full-size)' started by ironbut, Mar 9, 2010.
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  1. ProfFalkin
    Or enough room to hide a Magni 2 MB + Eitr under it. Hehehe

    Great work.
  2. Paladin79
    I definitely built my amps with room to spare. The black crack amp has a case double the size of the factory version, (two factory cabinets stacked, glued, and finished as one.) Knowing I would be using lacquer the base wood did not matter so much. There is a circuit board for the meters but it is no more than 2 inches by 3 inches and I have it mounted to the inside of one of the sides. I am going to go back and install a pre-amp out on my steampunk crack amp. I have been testing the carbon fiber black amp and really like the results and it was one of the easier changes to make on the Cracks IMHO.

    I will install a DAC inside my Crack amp, I ship the other to my son in a week or so when all my testing is done. I wanted to burn it in a bit and make sure all of the internal plugs and jacks I installed do not work loose in shipment. I made both amps so the top plate unplugs from the permanently mounted front and back plates for ease of upgrades. My son will be able to make his own upgrades if he so desires. Right now the biggest change I made was dual Alps volume pots rather than ganged pots.

    Last edited: Sep 6, 2017
  3. attmci
    Add a pair of these and make your son a happy camper: http://www.ebay.com/itm/1-pair-2pcs...d=162343179900&_trksid=p2047675.c100005.m1851
  4. Paladin79
    Give me your recommendations (thus saving me the research) and I may well get two sets. Voltage and capacitance you prefer? I do not have a schematic in front of me, which two capacitors are you replacing? Sorry to not know this but I spent most of my time on aesthetics.
  5. attmci

    The two output caps. You need 100uf/350V. There are a lot of discussions on cap upgrades.

    JamieMcC is the man of cap rolls. LOL
    Last edited: Sep 6, 2017
    Paladin79 likes this.
  6. Paladin79
    Yeah I know there are a lot of discussions lol, my life is complicated enough so I will go with the 100uf/350v for now. I began teaching my son electronics, computers and chess when he was four so any other cap changes, he can make. He shocked me by fixing his own plasma tv when I shipped him a few parts so he can handle things like this. I will ship his amp with those though. I am going to buy them before someone else talks me into another value.

    you have been most helpful attmci, thanks!

    I do not have the speedball upgrade in my amp yet so I will probably install the caps in it then figure out a different way to mount those boards.

    It is nice to know there are specialists in such things as cap rolling. I think my specialty from now on will be in finding someone with a cnc machine so I do not have to spend a day making all the cuts in the 1/8 inch copper I used for my three amp plates.

    It is time to call in some favors so I get the Mundorf caps at a low price.
    Last edited: Sep 7, 2017
  7. Renato Fury
    Is it possible to buy a bottlehead amplifier already built ?
  8. DavidA
  9. Renato Fury
  10. DavidA
    Unfortunately Bottlehead does not sell already built amps but I think it might have been mentioned in this thread that there are some who will build it for you, hope someone else can clarify this.
  11. ProfFalkin
    DavidA likes this.
  12. Paladin79
    Occasionally you will find them on Ebay as well and a couple folks on there seem to do quality builds. I am committed to building a couple more but my builds require some extensive modifications and they are not as cost effective as the gentleman listed on the Bottlehead site. The info given with the kits allows most anyone to build a kit but you would have to invest in some basic equipment so that part is up to you. I believe Alanmarkus pointed out that if you sell a completed kit on Head-Fi you are not allowed to profit from it so some of the best buys would come from here. If you do try to buy one here and there is an internal view of the wiring many of the folks here could probably give you an opinion on whether they believed it was a quality build. I have no doubt you would be assured of a quality build if you went with the builder recommended by Bottlehead, caveat emptor.

    IMG_1954.JPG I totally enjoyed my first build but it is not for everyone and I easily have $250 in additional parts, the labor I would rather not talk about. I also bought many pieces for this build that I did not use, I like choices, and i will use them on future builds.
    Last edited: Sep 9, 2017
  13. Renato Fury
    Does anyone know why the heck this company does not sell their already built products ? The Garage company offers this kind of service but unfortunately the Bottlehead does not, unfortunate, just when I'm interested in an amp I know it's good I discover that it can only be sold to customers like myself who do not understand anything about building amplifiers can build it.
  14. attmci
    That's the best part. DIY!
  15. Renato Fury
    The best part is to pair the amp with the headphone and enjoy the sound, I just want to plug and play.
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