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Crack;Bottlehead OTL

Discussion in 'Headphone Amps (full-size)' started by ironbut, Mar 9, 2010.
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  1. bloodhawk
    I used the spacers from this -https://www.amazon.com/gp/product/B018C19KJ0/ref=oh_aui_detailpage_o08_s00?ie=UTF8&psc=1

    Wrapped them in electrical tape for good measure.
     
  2. Demoninja
    Thanks for the suggestions, went with the set from Amazon. Just waiting for all the parts to come in and I can get started modding.
     
  3. Quadfather
    I am getting a low-level ringing in the Left Channel. When I tap on the tubes it goes away for a while. Does this sound like one of the tubes?
     
  4. FunyunBreath
    Yeah that sounds like microphonics in either the driver or power tube. If the tube is fairly new then sometimes that can go away with burn in. Try leaving the amp on for 3-4 days straight to give the tube cathodes time to form.
     
    Last edited: Feb 22, 2018
    Quadfather likes this.
  5. Quadfather
    There have been a few times that my Crack shuts itself off, but it's rare. When I tap on the power tube the ringing will temporarily go away. Sometimes that happens with the smaller tube as well. Damn, still sounds great. I have an RCA CRC 6080 and an RCA 12AU7A
     
    Last edited: Feb 22, 2018
  6. bloodhawk
    That is not normal. I would check the wiring pronto. Along with the solder joints, could be a cold joint somewhere.
     
  7. Quadfather
    What kind of solder should I use? I use tin- lead 60/40 rosin core solder to fix a loose wire but everything else looked good. And said it was for electronics.
     
    Last edited: Feb 22, 2018
  8. bloodhawk
    Any 60/40 rosin core leaded solder is fine. I personally prefer Kester. Though people would love to sell you on Cardas / Audio grade solder etc... But that is a totally different can of worms.

    Main thing with soldering though, is to use flux. Apply flux, heat up joints while feeding solder in. With the properly heated joints, the solder will easily flow across.
     
    Last edited: Feb 22, 2018
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  9. attmci
    All of the joints.

    Those two tubes can be obtained for $10 each, so no big deal.
     
    Quadfather likes this.
  10. Paladin79
    Most solder is hollow core and already contains rosin flux. On occasion extra flux is needed to clean new metal.
     
  11. Quadfather
    @bloodhawk, is it normal for one side of the tube to be so much brighter than the other?

    0222181904c_Film3.jpg
     
  12. bloodhawk
    Not really.
    But unless your voltages are off , or you are having channel imbalance , i think you should be ok.
     
    Quadfather likes this.
  13. Quadfather
    The channel balance is fine, and the amp sounds drop dead gorgeous. I am thinking maybe the tube imbalance in brightness is a sign that it's going bad which may be part of the problem
     
    Last edited: Feb 22, 2018
  14. bloodhawk
    Definitely could be, some tubes start becoming micro-phonic as they are about to go bad.
     
  15. hawkwindx
    What song or songs makes your Crack shine?

    It’s a question that’s been asked a lot, but it’s nice to discover something new. Something I recently discovered is “Sinatra At The Sands”.
     
    Last edited: Feb 22, 2018
    Quadfather likes this.
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