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  • The Power Tubes in my Vibrolux have turned...

    ...into a Blue Light Disco.
    But that amp still responds as usual.
    Should I...
    A. Take it to a Tech.
    B. Get naked and dance, dance, dance.
    C. Call the Police.
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    <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Zappa74</strong>
    <a href="showthread.php?p=47098936#post47098936" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
    </div>
    <div class="message">Beer is like overdrive pedals.<br />
    <br />
    At the volume I play, they're all the same.</div>

    </div>
    </div>
    </div> </div>

  • #2
    B. But please wait until I leave...









    Seriously - a blue glow to tubes is generally not a problem. When they glow BRIGHT red hot, they're about to go... a soft orange glow is generally OK too.
    **********

    "Look at it this way: think of how stupid the average person is, and then realize half of 'em are stupider than that."

    - George Carlin

    "It shouldn't be expected that people are necessarily doing what they appear to be doing on records."

    - Sir George Martin, All You Need Is Ears

    "The music business will be revitalized by musicians, not the labels or Live Nation. When the musicians decide to put music first, instead of money, the public will flock to the fruits and the scene will be healthy again."

    - Bob Lefsetz, The Lefsetz Letter

    Comment


    • #3
      Ah ok. Thanks Phil. Like I said, the amp runs fine. The blue glow might have always been there and I just never noticed.
      Is it possible for tubes to suddenly get a blue glow?
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      <div class="bbcode_postedby">
      <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Zappa74</strong>
      <a href="showthread.php?p=47098936#post47098936" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
      </div>
      <div class="message">Beer is like overdrive pedals.<br />
      <br />
      At the volume I play, they're all the same.</div>

      </div>
      </div>
      </div> </div>

      Comment


      • #4
        Yeah, I suppose... but I think it's probably more likely that it was always there and you just never really noticed.
        **********

        "Look at it this way: think of how stupid the average person is, and then realize half of 'em are stupider than that."

        - George Carlin

        "It shouldn't be expected that people are necessarily doing what they appear to be doing on records."

        - Sir George Martin, All You Need Is Ears

        "The music business will be revitalized by musicians, not the labels or Live Nation. When the musicians decide to put music first, instead of money, the public will flock to the fruits and the scene will be healthy again."

        - Bob Lefsetz, The Lefsetz Letter

        Comment


        • #5
          Ah ok. Thanks Phil. Like I said, the amp runs fine. The blue glow might have always been there and I just never noticed.
          Is it possible for tubes to suddenly get a blue glow?


          Sometimes handling them (with bare hands) will make them glow blue. My mate used to do it on purpose because you could see them through the front of his head and he thought it looked cool.

          Comment


          • #6
            Ah ok. Thanks Phil. Like I said, the amp runs fine. The blue glow might have always been there and I just never noticed.
            Is it possible for tubes to suddenly get a blue glow?


            Power tubes glowing blue/purple usually result from the amp being turned on with out a load attached, ie your amp may have been used without speakers which is NOT a good thing to do.

            I'm not sure but it might be able to be cause by an impedance mismatch as well (?).

            It is also possible that you have a bad connection somewhere with your speaker cable/jacks or even somewhere in the output stage of the amp.

            I'm no amp tech but I believe the blue/purple colour results from a build up of charge feeding back into the power stage of the amp then oxidising something within the tubes.

            The strange colour in and of itself does not necessarily mean the tubes are bad, but operating an amp under these conditions can is very unhealthy for your gear and can result in some nasty issues.

            I would strongly suggest getting it looked at by a tech before using it again just to be on the safe side - you never know what other components might be having issues and what consequences you get if you keep using it.

            tl;dr - take it to a tech.
            <p><strong><font color="#993300">Russian Dolphins</font></strong></p><br><p>Bandcamp -Â****<a href="http://russiandolphins.bandcamp.com/">http://russiandolphins.bandcamp.com/</a></p><br><p>Soundcloud -Â****<a href="https://soundcloud.com/russiandolphins">https://soundcloud.com/russiandolphins</a></p>

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            • #7
              Great Post ^^^^^
              Thanks!
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              <div class="bbcode_postedby">
              <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Zappa74</strong>
              <a href="showthread.php?p=47098936#post47098936" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
              </div>
              <div class="message">Beer is like overdrive pedals.<br />
              <br />
              At the volume I play, they're all the same.</div>

              </div>
              </div>
              </div> </div>

              Comment


              • #8
                Great Post ^^^^^
                Thanks!


                tbh that's all 2nd hand information so I may be somewhat full of ****************.

                I'd still play it safe and have someone take a peak.


                Some google-ing has revealed that there are a few causes for blue glow. Some tube types are more blue than others.

                What type of tubes are they?

                Is it intense blue or just a tinge?





                This thread needs Andreas...
                <p><strong><font color="#993300">Russian Dolphins</font></strong></p><br><p>Bandcamp -Â****<a href="http://russiandolphins.bandcamp.com/">http://russiandolphins.bandcamp.com/</a></p><br><p>Soundcloud -Â****<a href="https://soundcloud.com/russiandolphins">https://soundcloud.com/russiandolphins</a></p>

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                • #9
                  They're 6v6 or 6L6. What ever is in a Vibrolux Reverb.
                  The blue isn't hard intense. And it's defined to lines rather than an all over glow. Kinda looks like arcing.
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                  <div class="bbcode_postedby">
                  <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Zappa74</strong>
                  <a href="showthread.php?p=47098936#post47098936" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
                  </div>
                  <div class="message">Beer is like overdrive pedals.<br />
                  <br />
                  At the volume I play, they're all the same.</div>

                  </div>
                  </div>
                  </div> </div>

                  Comment


                  • #10
                    Dude... it's almost certainly fluorescence, and NOTHING to worry about. Seriously, if you feel it needs to be looked at, and the "blue tubes" is the ONLY "symptom" your amp has, take a video or picture and toss it up and I'll have a look. But from what you're describing, even without the pic, I'd be willing to bet there is nothing to worry about.
                    **********

                    "Look at it this way: think of how stupid the average person is, and then realize half of 'em are stupider than that."

                    - George Carlin

                    "It shouldn't be expected that people are necessarily doing what they appear to be doing on records."

                    - Sir George Martin, All You Need Is Ears

                    "The music business will be revitalized by musicians, not the labels or Live Nation. When the musicians decide to put music first, instead of money, the public will flock to the fruits and the scene will be healthy again."

                    - Bob Lefsetz, The Lefsetz Letter

                    Comment


                    • #11
                      Not that I can tell you anything, but can you get a decent photo?

                      Someone with a similar amp/tubes maybe able to tell if it's normal.

                      When did you last replace the tubes and did you get it re-biased?
                      <p><strong><font color="#993300">Russian Dolphins</font></strong></p><br><p>Bandcamp -Â****<a href="http://russiandolphins.bandcamp.com/">http://russiandolphins.bandcamp.com/</a></p><br><p>Soundcloud -Â****<a href="https://soundcloud.com/russiandolphins">https://soundcloud.com/russiandolphins</a></p>

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                      • #12
                        Here's a couple of articles you can read on the subject to help put your mind at ease - and a couple of pics too:

                        http://www.netads.com/~meo/Guitar/Tubes/blue_glow.html

                        http://www.jacmusic.com/html/articles/blueglow/blueglow.htm





                        ^^^ Completely normal.
                        **********

                        "Look at it this way: think of how stupid the average person is, and then realize half of 'em are stupider than that."

                        - George Carlin

                        "It shouldn't be expected that people are necessarily doing what they appear to be doing on records."

                        - Sir George Martin, All You Need Is Ears

                        "The music business will be revitalized by musicians, not the labels or Live Nation. When the musicians decide to put music first, instead of money, the public will flock to the fruits and the scene will be healthy again."

                        - Bob Lefsetz, The Lefsetz Letter

                        Comment


                        • #13
                          Blue glow is perfectly fine, it's caused by some loose electrons in the vacuum or something like that. No need to take it to a tech.
                          <div class="signaturecontainer">&quot;WANTED: Somebody to go back in time with me. This is not a joke. P.O. Box xxx, Oakview, CA 93022. You'll get paid after we get back. Must bring your own weapons. Safety not guaranteed. I have only done this once before.&quot;<br />
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                          <div class="bbcode_postedby">
                          <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Hiwatt Bob</strong>
                          <a href="showthread.php?p=43830676#post43830676" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
                          </div>
                          <div class="message">I think the project is interesting as ****************. ICP are always reinventing and redefining what it means to be dohp as ****************.</div>

                          </div>
                          </div>
                          </div> <font size="1"><font color="Green">Good deals:</font> JSutter, roaring20's</font></div>

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                          • #14
                            show's what I know

                            But seriously if you turn your amp on with no speakers/load attached your tubes often turn go blue. Do it for too long and it causes issues.

                            Obviously not the only cause.
                            <p><strong><font color="#993300">Russian Dolphins</font></strong></p><br><p>Bandcamp -Â****<a href="http://russiandolphins.bandcamp.com/">http://russiandolphins.bandcamp.com/</a></p><br><p>Soundcloud -Â****<a href="https://soundcloud.com/russiandolphins">https://soundcloud.com/russiandolphins</a></p>

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                            • #15
                              I've never heard that plugging your amp in without a load causes the tubes to turn blue.

                              I DO know that plugging your amp in without a proper load can cause Very Bad Things to happen - like blown transformers, fried parts - tubes, resistors, etc. And it doesn't take long, so avoiding that scenario completely is HIGHLY recommended. IOW, don't try experimenting to see if you can get your tubes to glow blue by connecting the amp without a load - ALWAYS run your amp with the correct impedance load connected!
                              **********

                              "Look at it this way: think of how stupid the average person is, and then realize half of 'em are stupider than that."

                              - George Carlin

                              "It shouldn't be expected that people are necessarily doing what they appear to be doing on records."

                              - Sir George Martin, All You Need Is Ears

                              "The music business will be revitalized by musicians, not the labels or Live Nation. When the musicians decide to put music first, instead of money, the public will flock to the fruits and the scene will be healthy again."

                              - Bob Lefsetz, The Lefsetz Letter

                              Comment

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