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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. kvtaco17
    High gain can aggravate an existing issue... My LD1+ never was microphonic when it was stock with any grados. I'd try tapping the tubes to see if its them causing the noise... Even try another pair.
  2. JoeDoe
    LD1+ + Voskhods + Padauk SR80is + Bad Company = What I'm talkin' bout!
  3. Endcode
    Hey guys, I was thinking about getting a new set of tubes for my I+. Im looking for something a little bit more dry and airy sounding, I'm currently using the basic 5654 tubes. The thing is, i think i lost my jumpers, so are there any tubes that would work in my current situation?
  4. gibosi
    Well, first, you can go to Radio Shack or any electronics part store and buy computer jumpers:
    GE 6HM5 fits your description and it works in the 5654 setup:
  5. SJWorne
    Yeah if I tap the tubes then I get the same noise... Guessing that this shouldn't happen?
    I'm pretty sure that my amp is set to low gain, but should I try switching it anyway?  It won't damage my headphones will it?
  6. signet02
    Ilove: Just an idea: If you want to really make the edge of your cut look pro, try using a sharpie pen on the cut edge... After that, no one will know it wasn't a factory job... It comes up shiny black, just like the exterior of chassis... PS: A little needle file work, and fine grit cloth before may also help...
  7. gibosi
    You can try changing the gain setting, but I doubt it will make any difference. Some tubes are microphonic and some are not. If the microphonic noise is driving you nuts, then replacing the tube(s) is the only solution. On the other hand, if you usually stay somewhat immobile while you listening, then maybe it is something you can ignore.
  8. SJWorne
    Ok thanks for that!
    I have some 'Valvo' 6CQ6 tubes.  Will maybe try some of the mullard m8161's :)
  9. MunkyOne
    Hi SJWorne,
    I tried the same Valvo 6CQ6, and found them to be very microphonic indeed, though quite good sounding after a period of burn-in.  I replaced them with the Mullard M8161 (CV4015) which are not at all microphonic.  I can tap them and hear nothing through my headphones.  They are mil-spec, so probably have more robust innards, less prone to vibration.  Additionally, the Mullards sound quite a bit more refined in every way than the Valvo 'equivalent'.  Like all Mullards, the M8161 is on the warm side, but in a very likeable way, if warm is your taste.
  10. SJWorne
    Hi Munky, thanks very much for clearing that up, glad it's not just my amp/tubes! :)
    I can't say i've had enough experience with tubes and warm/cold sounding tubes/amps/DAC's, but I will get some to try out! :)
    Thanks again!
  11. i luvmusic 2
    Or you can cut a opening on the bottom plate. DSC_3145.jpg
  12. i luvmusic 2
    I have the same problem but only with MULLARD 6AM6S/M8083 tubes try swapping tubes.
  13. SJWorne
    Will do! :)
  14. i luvmusic 2
    I know it works for me Good Luck.
    SJWorne likes this.
  15. signet02
    Ilove: I'd like to be able to do that; however, I currently have my LD1+ on top of my digital piano, and with the WE408A tubes, the unit runs a lot hotter... I know the top of the Yamaha CP 300 is metal, and that it can take a certain amount of heat... But I don't know how much before it might discolor the paint... Perhaps the cut-out would make the unit run cooler, but the heat would likely radiate out of the bottom cut-out, possibly making the heat transference to the piano top issue worse... So, there's a question-mark there...
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