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amptech question: tubing a fireball - please help

Discussion in 'Backline' started by hoehlentroll, Jun 4, 2012.

  1. hoehlentroll

    hoehlentroll Member

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    I read that the "grading" systems makes retubing a piece of cake. I opened the amp and found this:

    [​IMG]
    [​IMG]
    [​IMG]

    I bought the amp new in local store and the tubes where stock. the tubes are about 5 years old :Smokedev: *i know, I know*

    1. what does the different tubing do to the sound?
    2. could this by any means be NO fault?
    3. what should I do now? a. buying grade 22 or 27 or b. take the amp to a tech which means LOADS of money. I live near Tube Amp Doctor (TAD-tubes).

    I have no fucking idea of how to bias a tube amp!

    EDIT: funny thing: http://www.urbandictionary.com/define.php?term=tubing
     
  2. TheWinterSnow

    TheWinterSnow Den Mørke Natt

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    The grading number is simply the amount of idle current that the tube will conduct when the tube is placed in a typical amp. Higher numbers means that the tube will run a little warmer. You should pick up a matched set, meaning that they are the same or one number off, just buy a set of matched tubes, put em in and be done with it.
     

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