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psarkissian

Service Engineer Moderator
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Posts posted by psarkissian


  1. "... just for giggles, I'll take another whack at it... though I suspect you already know exactly what I meant. " ---

    Yeah, sort of, pretty much.

     

    I was in solid when it was in for servicing the time before. Don't know what happen between then and the time it came.

    Either way, you know me, I take of it one way or another. Always give it a good going over,... my sort of obsessive work ethic.

     

    "... 10 other things done to the instrument that have nothing whatsoever to do with the nut, since it was already there anyway." Is that better? " ---

    Yes, very good  :)

     


  2. " ... I guarantee that's all they did to it when it got there anyway. " --- Don't mean to be technical, but it's not a guarantee you can make. 

    Being the guy at Line 6 that services Variax guitars, I can guarantee the otherwise opposite of that.

     

    However, white glue like Elmer's works very well on nut slots. Holds well enough to do the job and still allows to tap it out when a

    string nut needs to be changed out. Yes,... wood glue like Tite Bond original wood glue works well. Very good.

     

    Yes, a simple line up and glue job would do, but I give it full-on going over. It had a solid in-there string nut on its prior visit before that.

    Of that I can guarantee.

     

     


  3. If you have the interface accessory kit, then try using that to re-Flash.

    -Connect as you normally would.

    -Insert the charged up JTV battery into the battery box.

    -Plug a stereo 1/4" (TRS) headphone adapter into the 1/4" jack, listen for the click of the relay.

    -The interface device LED's should both be green.

    -Proceed with the update using Monkey.

     

    If that doesn't do it, then it should be checked out by an authorized service center in your area.

     


  4. -USB adapter is for connecting the computer to use Monkey or Workbench HD, not for playing through.

    For playing connect with 1/4" TRS guitar cable when using the battery, or the VDI cable when connecting

    through the VDI post on the Helix.

     

    -The strings you are using should be fine. Don't go lighter than 9's or heavier than 11's. Variax is designed

    with 10's in mind. The factory set are D'Addario XL-110's.

     


  5. "Have you had any other DT-50 failures with the input gain switching? " --- Gain switching on a CoDec,...

    a bit more involved than that. There is a standard set of circuits used on the front end of CoDec's.

     

    So Angelo,

    Op-amps are set-up in +In, -In to balance inputs to a CoDec, aka- reference drivers or line drivers. Typical

    with chip company's application notes. Cirrus, who also acquired Cypress some years back, and companies 

    like AKM will have these kinds of front en circuits in their app notes. As well as a similar circuit on the

    analog out of a Codec.

     

    The old ADAT's used Cypress Codec IC's back in the day, before Cirrus acquired them. High quality

    20-bit back then when I service tech'd for Alesis 20-years ago (geez, has is been that long?).

     

    And Angelo,... also check out a paper on current steering DAC outputs for high quality audio (by my pal) Malcolm

    Hawksford at Audio Research Lab, University of Essex, UK. Love his work.

     

    https://www.researchgate.net/publication/269102687_CURRENT-STEERING_TRANSIMPEDANCE_AMPLIFIERS_FOR_HIGH-RESOLUTION_DIGITAL-TO-ANALOGUE_CONVERTERS

     

    When using the correct of the two inputs input gain and clipping are a problem, and it's not related to

    the guitar being turn up full-on, the main reasons tend to be the input board, the tubes and/or tube bias.

     

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