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Little Dot I+ Tube Rolling

Discussion in 'Headphone Amps (full-size)' started by mapstec, Sep 16, 2008.
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  1. JoeDoe

    Good for you man! Glad to hear you dig it. The hum could be one of several things: 1. Stock tubes 2. Improper grounding 3. Power supply.

    Have any other tubes to try?
     
  2. cshea71
    Unfortunately I haven't received my other tubes yet.  I have tried trouble shooting by doing everything that I could think to do without replacing the tubes.   I guess I couldn't try to run it without the tubes in it?  That would probably screw it up.   I can just wait for some new tubes.   I was hoping that this would be something that someone else may have run into.   The AC plug that I have has a ground on it.   I hope it isn't the power supply that would be a drag.
     
  3. Arsis
    What non-Grado cans do guys like with your LDI+? Not diggin' my LD... I sold my Grado SR325is.
     
  4. JoeDoe
    1. That's too bad. To me, the little dot was made for Grados.

    2. I also love what it does to the Sony MDR V6. Smooths the top end and add some noticeable soundstage.
     
  5. Arsis

    The Grados just weren't for me. Too much treble tilt for my ears and too uncomfortable for the price.
     
  6. gibosi
     
    New tubes are often noisy and will quiet down after 20 or 30 hours, and this is the most likely cause. Cleaning the pins might also help. The other common cause is stray RF from cell phones, printers, refrigerators and so forth, so you might want to move the amp around on your desk to see if it makes a difference. And perhaps even move it to another room as a test.
     
    And no, I would not advise you to run the amp without tubes....
     
  7. cshea71
    Thanks!   I am hoping that is the case.   This is my first time with tubes, or even amps in general and I am so happy with what I hear so far, just would be nice to have the buzz cleaned up.  I have some more tubes coming to swap out, so that will help i think.   I have tried getting it away from RF interference, as well as isolated it to a single power source aware from power strips.   I have checked all the screwed to make sure they are tightened, and I have tried it with a different power cord all with the same results.   I am hoping that it will calm down a bit after I change out the tubes and I don't have to start going McGiever on it.....
     
  8. gibosi
    And again, new tubes often buzz and hum, so the next pair you plug in might be noisy too.  Give them 20 or 30 hours to settle down before judging them as "bad". 
     
  9. i luvmusic 2
    Most common source of my LD 1 noise is from my FURNACE but with Octal tubes have no noise.
     
  10. cshea71
    Hi guys,
    Again, I hope that I am not overlooking an already discussed issue with the LD I+, but thought I should go ahead and ask about using LD and DACs.   What DACs do you use in your system, and just how necessary are they with the LD I+.   I have a Syba USB, which I was using with my Macbook Pro, but I started just using the onboard sound card with the LD (Bypassing the Syba) and I think it sounds just fine.   I really don't hear any interference with the hard drive or any of that jazz.   Again, it may be that the Syba is just not a very good DAC.  Also, I know that there is a lot of conflicting information regarding wether or not a USB transfer is as good as SPDIF, and that is i guess what I have when I am going  from 3.5 out to RCA, no?   I am so confused.....
     
  11. gibosi
     
    For someone just beginning, for the money, it is hard to beat one of hifimeDIY's Sabre DACs.
     
    http://www.hifimediy.com/
     
  12. JoeDoe
    +1 
     
    I use the U2 and I'm pretty satisfied since most of my listening is done from my MacBook Pro.
     
  13. cshea71
    Do you hear a huge difference when you take the DAC out of the lineup?   And if so how do you quantify or qualify the difference.   Is it night and day?
     
  14. i luvmusic 2
    I finally received my Opamp( OPA2107AP)from snail mail sevices  and i 've been listening to it for 2 hours now i can't tell the deference between the stock opamp and this schiit not like swapping tubes you can actually tell the deference right on the spot.[​IMG]
     
  15. JoeDoe
    I don't think I'd say huge, but certainly noticeable. The DAC for 1. has more dynamic range 2. better definition at the extremes of the freq response. Trying listening for the super highs and super lows.
     
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