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Thread: Issue with Crate TX50DB Limo battery amp

  1. #1
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    Issue with Crate TX50DB Limo battery amp

    Hey folks, Want to know if anyone has had experience with the battery operated Crate TX 50DB Limo? The owner says its making noises. It plays fine to me except when in SLAP or DELAY mode on the DSP dial. After 5 or 10 minutes of warm-up, there is a little bit of electronic static at the end of the of the note when driving it hard? Hard to explain, but it is not very musical. Other than that, it seems to play like a normal cheezy SS amp modeling amp. Anyone have any experience with these? Or any idea what would cause this? I believe it is not too old. 2001 or later?
    Is 10 years 'obsolescence' on some of these 'modern marvels'? Could it be the battery 'going south'? How do you know?
    Thanks for any enlightenment....Rod

  2. #2
    Supporting Member Jazz P Bass's Avatar
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    Crate Limo

    The battery should read 12-13 Vdc when charged.
    I had one of these come in a while back.
    The battery had a bad cell (would not charge past 6 Vdc).
    It also had weird noises going on.
    I resoldered/reflowed the whole amp.
    Even the DSP board.
    That resolved the noises.
    PS: Make a drawing of where the connectors go. It is not hard to mix them up.
    Attached Files Attached Files

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    Thanks Jazz P bass. Makes sense to me! On the subject of re-soldering/re-flowing these pcb,s. I have discovered that there is often -times a film on them that seems to make the re-flowing process a little slower and messier than it would otherwise be when starting with clean surface pads. Can anyone enlightment me on what is the best way to clean the board prior to re-flowing? Is there a certain product/technique that works well for cleaning oxidation or flux residue from the back of pcb,s?

  4. #4
    Senior Member pecorporation's Avatar
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    Had a couple of those where the problem was in the pc board jumper cable plugs. The pressed in wires were not pressed in all the way. May wanna glance at those as well.
    CAUTION!!! Solid state and tube amplifiers contain lethal voltages and can retain them even after unplugged. Refer service to qualified technician.

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    Thanks, I will check those also. Another thing I notice with this amp....With unit on(no inputs) when rotating the DSP pot, there is static(crackle) when rotating through the various effects AND when turned to the bypass mode there is a continuous high-pitched tone emitted. This doesn,t seem right. I don,t have a footswitch to check out that function. Any ideas on that?

  6. #6
    Senior Member pecorporation's Avatar
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    Sounds like failing solder connections to me. Verify your power source is up to snuff, 12-13VDC and then go looking for solder faults.

    I would just reflow everything (like Jazz P stated), jacks, pots, output amp, filter caps, large resistors and even the pc plug pins. Also, spray a little deoxit in those pots & jacks. Using solder flux helps break down solder surface oxidation and allows the solder to flow smoothly.
    CAUTION!!! Solid state and tube amplifiers contain lethal voltages and can retain them even after unplugged. Refer service to qualified technician.

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