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Any way to test power tubes if the preamp tubes are blown?

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  • Any way to test power tubes if the preamp tubes are blown?

    In my 5150 II, two of the 12AX7 preamp tubes are blown/dead/whatever - all i know is that unlike the other four, they are cold when i turn them on. And so are all the 6L6's, but if the preamp tubes aren't working, shouldn't the 6L6's not have any power in them anyway?

    If i'm right in assuming this, how do I check if the power tubes are dead? it wouldn't be a big deal to have to replace them too, but it would be nice to not have to spend the money on another four.
    <div class="signaturecontainer"><font size="1">I'M NOT REALLY A DENTIST!<br />
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    <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>BrendanO</strong>
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    <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Scott K</strong>
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    <div class="message"><font size="1">Going through this thread is like reading a list of gay.</font></div>

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    </div> <div align="center">My Super-Meh rig:<br />
    <br />
    MIM Tele Standard / LTD M1000 / Ibanez RG7321 / Agile AL3500 Les Paul -&gt;<br />
    Boss TU-2 -&gt; Digitech Bad Monkey -&gt; Line 6 DL4<br />
    Peavey 5150 II -&gt; Marshall 1960B w/75s<br />
    Squier Vintage Modified Jazz Bass<br />
    Washburn D10SCE Acoustic<br />
    Line 6 POD X3 Live</div></font></div>

  • #2
    I believe you have a larger issue than dead tubes. Find a couple of 12ax7 and throw them in those spots. But I think those will not work either. Tech time.
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    • #3
      well i dont like ... have tubes laying around

      what do you think it is though?
      <div class="signaturecontainer"><font size="1">I'M NOT REALLY A DENTIST!<br />
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      <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>BrendanO</strong>
      <a href="showthread.php?p=21794207#post21794207" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
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      <div class="message"><font size="1">&quot;I like the music, but hate the vocals&quot; is the battle cry of the clinically retarded.</font></div>

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      <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Scott K</strong>
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      <div class="message"><font size="1">Going through this thread is like reading a list of gay.</font></div>

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      </div>
      </div> <div align="center">My Super-Meh rig:<br />
      <br />
      MIM Tele Standard / LTD M1000 / Ibanez RG7321 / Agile AL3500 Les Paul -&gt;<br />
      Boss TU-2 -&gt; Digitech Bad Monkey -&gt; Line 6 DL4<br />
      Peavey 5150 II -&gt; Marshall 1960B w/75s<br />
      Squier Vintage Modified Jazz Bass<br />
      Washburn D10SCE Acoustic<br />
      Line 6 POD X3 Live</div></font></div>

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      • #4
        Do the lights go on in front of the amp? Or it doesn't turn on at all?

        Check all the fuses.

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        • #5
          In my experience, when the Power Tubes started failing, it killed the Fuse and wouldn't power up at all. I don't think the Preamp tubes are the issue here.
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          • #6
            Well, i guess since everyone has decided to only say vaguely ominous things to indicate that they think it's not simply dead tubes, i'll elaborate

            The amp powers on, the standby works, all the lights on the front work, so it's not a fuse.

            However, I just swapped the pre amp tubes around, and its the slots that are broken, not the tubes. the 1st and 3rd preamp tube slots are cold no matter what tube i put in it.

            And no sound comes out of the amp when plugged into a guitar/cab.
            <div class="signaturecontainer"><font size="1">I'M NOT REALLY A DENTIST!<br />
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            <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>BrendanO</strong>
            <a href="showthread.php?p=21794207#post21794207" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
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            <div class="message"><font size="1">&quot;I like the music, but hate the vocals&quot; is the battle cry of the clinically retarded.</font></div>

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            <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Scott K</strong>
            <a href="showthread.php?p=30309740#post30309740" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
            </div>
            <div class="message"><font size="1">Going through this thread is like reading a list of gay.</font></div>

            </div>
            </div>
            </div> <div align="center">My Super-Meh rig:<br />
            <br />
            MIM Tele Standard / LTD M1000 / Ibanez RG7321 / Agile AL3500 Les Paul -&gt;<br />
            Boss TU-2 -&gt; Digitech Bad Monkey -&gt; Line 6 DL4<br />
            Peavey 5150 II -&gt; Marshall 1960B w/75s<br />
            Squier Vintage Modified Jazz Bass<br />
            Washburn D10SCE Acoustic<br />
            Line 6 POD X3 Live</div></font></div>

            Comment


            • #7
              Well, i guess since everyone has decided to only say vaguely ominous things to indicate that they think it's not simply dead tubes, i'll elaborate

              The amp powers on, the standby works, all the lights on the front work, so it's not a fuse.

              However, I just swapped the pre amp tubes around, and its the slots that are broken, not the tubes. the 1st and 3rd preamp tube slots are cold no matter what tube i put in it.

              And no sound comes out of the amp when plugged into a guitar/cab.


              Definitely tech time!
              <div class="signaturecontainer"><div align="center"><font size="1"><font face="Arial"><u>Gear</u><br />
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              • #8
                yeah all the local places around here are closed on sundays, so it looks like this will have to wait til tomorrow at least.

                humbug
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                <div class="bbcode_postedby">
                <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>BrendanO</strong>
                <a href="showthread.php?p=21794207#post21794207" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
                </div>
                <div class="message"><font size="1">&quot;I like the music, but hate the vocals&quot; is the battle cry of the clinically retarded.</font></div>

                </div>
                </div>
                </div> <div class="bbcode_container">
                <div class="bbcode_quote">
                <div class="quote_container">
                <div class="bbcode_quote_container"></div>

                <div class="bbcode_postedby">
                <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>Scott K</strong>
                <a href="showthread.php?p=30309740#post30309740" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
                </div>
                <div class="message"><font size="1">Going through this thread is like reading a list of gay.</font></div>

                </div>
                </div>
                </div> <div align="center">My Super-Meh rig:<br />
                <br />
                MIM Tele Standard / LTD M1000 / Ibanez RG7321 / Agile AL3500 Les Paul -&gt;<br />
                Boss TU-2 -&gt; Digitech Bad Monkey -&gt; Line 6 DL4<br />
                Peavey 5150 II -&gt; Marshall 1960B w/75s<br />
                Squier Vintage Modified Jazz Bass<br />
                Washburn D10SCE Acoustic<br />
                Line 6 POD X3 Live</div></font></div>

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                • #9
                  There was a thread here a LONG time ago about 5150 problems. It had a link to a web site that showed there's like 5 or 6 internal fuses in the amp. I'd look there first.

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