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MAD Ear+ Purist HD thread.

Discussion in 'Headphone Amps (full-size)' started by lmilhan, May 22, 2007.
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  1. whirlwind
    pm me your address and i will scan the schematic and get it out to you [​IMG]
     
  2. whirlwind
    e-mail has been sent ...with schematic attached  [​IMG]
     
  3. kramer5150
    Hard to tell from the pics, but those just look like chassis ground screws.  An improperly grounded circuit can be a bad thing.  Like your amp my darkvoice was damaged in S/H and one of the first things I did was to tighten down all chassis grounds.  I never encountered any "fireworks" though, admittedly it was very nerve-racking, and a couple of the screws were way to close to the cap reservoir for my comfort so I left those alone.  Seems strange that a chassis ground node would have that much voltage potential built up on it.  Good luck, I hope it all works out for you!!
     
    Tube voodoo is a weird thing... IMHO its more art than science/engineering.  At one headfi meet my DV339 popped a fuse... for no reason at all.  I was bummed, but I had extra fuses and I just plugged in a new one and its been fine since (knock on wood).  strange !!
     
     
    best of luck to you!!
     
  4. Textfeud
    Yeah, it's pretty weird. I don't nearly know enough so I'll just let a friend of my fathers have a look at it and hopefully he can fix it :)
     
  5. parbaked

    Please ALWAYS unplug your amp before opening it up and touching anything inside.
    Otherwise a loose screw could be the least of your problems!
     
    wormsdriver likes this.
  6. Textfeud
    Yep, I did that. But I opened it up 15 minutes after unplugging maybe there still was some electricity in there somehow. Not sure, but it surprised me to say the least :wink:
     
  7. whirlwind
    maybe touched a capacitor
     
  8. parbaked

    That's them quality Hammond transformers holding juice.
     
  9. Textfeud
    But if I were to touch it tomorrow after 12 hours I would not electrocute myself right?
     
  10. parbaked
    [quote name="Textfeud" Mine is very old too. I'm guessing 10 years old, so the
    [/quote]

    That explains it. His newer amps are designed to NOT catch fire after shipping....:D
     
  11. whirlwind
    That explains it. His newer amps are designed to NOT catch fire after shipping....[​IMG][/quote]

    [​IMG]
     
  12. Textfeud

    That explains it. His newer amps are designed to NOT catch fire after shipping....:D[/quote]

    Lol. Well this hasn't been this best couple weeks audio wise. Broke the needle of my turntable two weeks ago so this was to be expected by murphy's law :wink:
     
  13. parbaked

    Lol. Well this hasn't been this best couple weeks audio wise. Broke the needle of my turntable two weeks ago so this was to be expected by murphy's law :wink:[/quote]

    You'll be fine!
    There's nothing inside your MAD that can't be fixed. It is a simply wonderful design.
    Sorry for the inconvenience though.
     
    Textfeud likes this.
  14. Textfeud
    Does anyone know/can anyone show how to replace the fuse? I fixed the innerworks (the three condensors were loose and should have been on the tape, probably the cause of all trouble), but the fuse is damaged beyond repair.
     
    EDIT: Found it. The glass tube was stuck which made it weird to me. It's actually pretty easy to replace if the wires aren't burned through.
     
  15. Textfeud
    Well, I have an update. Brought it to a specialist and he e-mailed me in shock because the voltage had been plugged directly into the rectification instead of through the transformer (am I saying this right?). This is very very very dangerous. I'm glad I didn't try to fix it myself. The owner before the previous owner transformed the 115V to 220V (obviously the seller didn't tell me until after I received it) and he didn't do a very good job to say the least. The transformer is gone and so are the hexfets and some soldered wires. So this is going to cost me at least 200 euro. E-mailed the previous owner and he accused me of "being aggressive" because I told him he didn't take me serious and doesn't even want to search for a solution. He keeps insisting the amp is fine and it's not his fault it's broken. He doesn't even want to talk anymore. I just learned he is also active on this forum so if he doesn't provide a solution I can at least give him a negative feedback. 
     
    Oh well, guess I got screwed [​IMG] 
     
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