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  1. #1
    Eruption rolsguitars's Avatar
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    01.22.09 @ 08:08 AM
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    Guitars I know, ampheads however I do not,
    my 5150 just quit, the volume went down really low then came back up then went completly out,
    the power is on but the tubes are not glowing,
    now if one tube goes out do they all quit glowing ? or did I just lose my pre amp tubes ??
    the 12ax7 jobbies ??

  2. #2
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    09.08.06 @ 10:08 PM
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    hey rol, you might want to ask at under the amp forum. there are a lot of 5150 tech heads there [img]smile.gif[/img]

  3. #3
    Romeo Delight
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    12.31.69 @ 04:00 PM
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    Power tubes are set up in pairs, and one or even a pair can go and the amp could theoretically still work. BUT, there are internal fuses to protect the amp against runaway tubes, and these usually blow when a tube goes. This shuts the power tubes down.
    That is what I am guessing happened, but that is just a guess without looking at the amp.

    I don't think it is a preamp tube, those can fail and the power tubes could still glow. Still, it is worth takng a look at them. If the "getter" (the silver looking coating inside the tube) has turned white or clear, that tube is bad. Tubes can also fail with no visible indication, but the white coating is a definite giveaway. Replace any like that and see what happens.

    When preamp tubes "blow", it is usually no big deal, just replace it and you are ready to go.
    If a power tube blows, or if they are not lit, you really ought to have a tech check it out. It may not be all that serious, but power tubes use a lot of current. When they fail all of a sudden like that, they sometimes take other components with them.

    If you need any help finding a service tech, let me know -
    Roger C



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