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Help with my Hartke LH500

Discussion in 'Amps [BG]' started by STRINGSLINGER, Nov 17, 2013.

  1. STRINGSLINGER

    STRINGSLINGER Supporting Member

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    I am a little lost on this one. I was in the middle of a show the other night when my volume level seemed to drop out. Though there is still output it seemed to be cut in half. I initially thought maybe I lost a speaker but that was not the case. In the past I very rarely took the amp past 3 as that was sufficient enough power. I have swept the volume control up and the volume level increases evenly to about 7 then wham-o, it seems to jump to 11. Any ideas as to what else I should be looking at? Should I change out the tube? I absolutely love this amp, so any help would be greatly appreciated. Thank You
  2. JakeTrippATW

    JakeTrippATW

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    Could there possibly be a wiring issue in your bass? Maybe a bad pot or input jack needing attention?
  3. spaz21387

    spaz21387

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    The tube is a good first easy thing you can swap out yourself. I found new old stock jan phillips 12ax7wa's sound amazing in the lh500. I have 3 of those bad boys saved up for when the one in there decides to die.
  4. dbase

    dbase Gold Supporting Member

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    Happened to me in the middle of a set. It was a weak battery in my active bass.
  5. mokkat

    mokkat

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    you should of course test with another tube and make sure it wasn't the bass.

    It wouldn't surprise me if something broke in the amp though. I have a LH500, and though it is an amazing design, it's let down by the build-quality. Mine broke after a few months, it had something wrong with the power-amp.

    It's still very much worth it to me though, as it's dirt cheap new and fixable on the warranty.
  6. STRINGSLINGER

    STRINGSLINGER Supporting Member

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    Thanks for the replies! I have ruled out the bass right away. It does not matter if I am on a passive or active bass. I will try replacing the tube a little later in the week. Thanks
  7. JimmyM

    JimmyM Supporting Member

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    Also try cleaning the effects loop jacks with Deoxit. Sometimes they can corrode on you and cause stuff like that to happen.
  8. jjk2007

    jjk2007 Supporting Member

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    Yep, check the tube and the fx jacks like Jimmy said. I originally never noticed the volume jump (never ran my LH1000 that hot) but it's definitely there around 6.5 or so on the volume. I have yet to run it up at that level on a gig though.
  9. STRINGSLINGER

    STRINGSLINGER Supporting Member

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    I will be pick up a couple of 12ax7's tomorrow and try them out. As well as cleaning the fx jacks. I will keep ya posted on my findings. Thanks again all.
  10. Crystalman85

    Crystalman85

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    Sorry to hear about your trouble. I own a hartke lh500 myself and so far I haven't experienced any problems with it what so ever. but since you guys mentioned tube troubles, I should look out for that.
  11. JimmyM

    JimmyM Supporting Member

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    I know Larry had a run of tubes that were not great a year or two ago. Seemed like a lot of people were having to replace them. But not his fault...tube QC just ain't what it used to be.
  12. STRINGSLINGER

    STRINGSLINGER Supporting Member

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    JimmyM - About 1 1/2 years ago, I was doing a little web searching about the LH500 prior to purchasing one, which brought me to TB via comments by Larry Hartke in lieu to the LH500 on others posts. The way he stands behind his product is what convinced me to pop on one. I hope replacing the tube will remedy the issue, but if it doesn't, I'm confident that the Talk Bass community will help guide me to a fix.
  13. Crystalman85

    Crystalman85

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    I see what you mean. some tubes don't last that long. other tubes tend to break on their own. I was thinking I should have a spare tube just in case something happens to the tube on my hartke lh500.
  14. JimmyM

    JimmyM Supporting Member

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    Probably wouldn't hurt. Keeping a tube safely on the road is a bit of a problem, though. Keep it padded and wrapped up if you do it.

    And yes, even though I endorse Ampeg, I've always been quite impressed by the way Larry stands behind his products.
  15. STRINGSLINGER

    STRINGSLINGER Supporting Member

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    It'twas the tube. One of the contacts just inside the glass was folded over like a burnt out filament in a light bulb. Right as rain. Thanks TB.
    Y'all are awesome!

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