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Display monitor noise

Discussion in 'Computing' started by cathode_ray, May 1, 2010.

  1. cathode_ray

    cathode_ray Active Member

    Do LCD displays create the same amount or type of noise (EMI) as a CRT. I currently use an ancient CRT. Singe coil pickups are very susceptible to it - have to stand 10 feet away at certain angle...
    And if I get a new LCD display will I have to change my user name also?
  2. Big K

    Big K Well-Known Member

    Hello Cathy
    No, TFTs and LCD do not emit the same kind of radiation simply because they don't use high voltage and don't feature magnets to direct a electron beam onto the display mask of the CRT. If LCD monitors produce a disturbing electric field it is either a low quality powersupply or a faulty circuit. None of my 4 sets of TFTs cause a humm with single coils PUs.
    Other gadgets around, especially light dimmers, can still cause trouble, though. If you have your special studio guitar you might want to fit a symmetrical output to obtain an even better signal-to-noise ratio and protection against interfering radiation.

    If you own another tube driven device you may be allowed to keep your name.
    In there are small cathode rays doing their fine job, as well. Long live my tube amps.......
  3. cathode_ray

    cathode_ray Active Member

    I'm so relieved - took me yeas to acquire that moniker. Oh, and thanks for "clarifying" the emi issue. I've noticed if I stand in certain orientation the hum is mitigated. Expect phase cancellation is at play...

    C. Ray
  4. Big K

    Big K Well-Known Member

    Heheh, I don't think it would have mattered, anyway. You can always put a carton box over the TFTs when being visited.. ;-)
    Btw, my "Big K" was given to me by an American Sgt. Major & friend when I served at NATO AFCENT HQ (electronic developements & interfacing) in the Netherlands.
    I found big is ok since I am not really tiny.....

    Phase cancellation and some blind spots... That ist the reason, alright..
    The importance of clean undisturbed signal and the multitude of possible interferences makes me really wonder why industry hasn't introduced
    symmetrical signal transfer as standart a long time ago. Can't be the costs alone...must be a bit of ignorance and stupidity, too.
    For months I have a Lundahl output transformer for my latest guitar in the drawer, but no time to fit it, which needs care and time.

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