$450 for (fixable?) VOX AC30

Discussion in 'Amp Tech Center' started by zanesaddiction, Nov 5, 2014.

  1. zanesaddiction

    zanesaddiction Tele-Meister

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    My friend offered me his Vox AC30 2x12 with greenbacks for $450. He says he thinks it's fixable, but he is tired of dealing with it and doesn't want to put any effort in fixing. There's no LOCAL amp repair places....Is this worth taking a chance on?

    Here's what I know-

    It powers on. There is no sound / very quiet sound coming through. Then it will cut in full volume randomly.

    I assume since there IS sound, this isn't a terminal problem. What else should I find out about it before I think about buying it?

    Any suggestions welcome ! :)
     
  2. zanesaddiction

    zanesaddiction Tele-Meister

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    It was taken to local small guitar shop. He checked the tube seating and blew out the circuit board with air, and the jacks. He didnt take anything out to look or anything though....
     
  3. muchxs

    muchxs Doctor of Teleocity

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    What era AC30?

    If it's an old one yeah, it's definitely worth fixing.


    Questions you should ask yourself:

    "Am I capable of fixing this myself?"

    "How hard is it to find someone to fix it?"

    "What will it cost to have someone else fix it?"

    "What is it worth when it's working properly?"

    "Does the cost of the amp plus the cost of repair exceed its resale value?"

    Those are generally the biggies.

    Might be something as simple as a bad speaker connection. I had the shell on a 1/4" phone plug unscrew from the vibration of a cranked amp intermittently shorting the output.

    More likely it has a bad solder joint somewhere in its innards. Hint: Anything inside that has been obviously worked on is the first place to look.

    Check the solder joints at the inputs. Maybe someone tripped over their cord?
     
  4. zanesaddiction

    zanesaddiction Tele-Meister

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    It's a newer AC30. Obviously I jumped right into talking about fixing it. I am NO amp repairman. Basic soldering skills but I am a hound on the forums and am very determined when I have specific projects.

    Not a great answer , I know.

    Opinions?
     
  5. zanesaddiction

    zanesaddiction Tele-Meister

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    It does seem like a solder joint, no? It would be great if it was simple.
     
  6. muchxs

    muchxs Doctor of Teleocity

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    I won't buy a working amp without looking inside first. Look inside.
     
  7. zanesaddiction

    zanesaddiction Tele-Meister

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    Ok. He may let me take it home to inspect. What should I look for ? I take some snapshots...
     
  8. muchxs

    muchxs Doctor of Teleocity

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    Take a look at the solder joints especially the one subjected to mechanical stress. The likely candidates are the inputs and anything with a large unrestrained part soldered to it.

    Chances are the fault is so subtle a digital camera won't show it. You never know, though.
     
  9. Lucky Day

    Lucky Day Tele-Afflicted

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    Considering you can buy a working one for $600 if you're careful, I'd never pay more than $300 for one that wasn't working.
     
  10. zanesaddiction

    zanesaddiction Tele-Meister

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  11. zanesaddiction

    zanesaddiction Tele-Meister

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    <iframe width="100%" height="450" scrolling="no" frameborder="no" src="https://w.soundcloud.com/player/?url=https%3A//api.soundcloud.com/tracks/175515415&amp;auto_play=false&amp;hide_related=false&amp;show_comments=true&amp;show_user=true&amp;show_reposts=false&amp;visual=true"></iframe>
    Trying different embed code.

    I recorded the amp making the noise. I discovered it only cuts out when the FX Loop is not bypassed (there's a switch to bypass it). Hear it cut back in too.

    Hope this embed link works.
     
  12. Dismalhead

    Dismalhead Poster Extraordinaire

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    If you can't figure it out easily before making the commitment to buy, I'd pass. You can get one used in perfect condition for $600. At least to me, it's not worth saving $150 buying something that might need a complete overhaul. Professional amp repair is expensive, and most guys will charge you $150 just to diagnose your issues.
     
  13. Cleeve

    Cleeve Tele-Holic

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    It sounds to me like the contacts built into the effect jack are oxidized and intermittent.
    Happens all the time, it's why they put a bypass switch on there, so the amp will work even if that lame contact fails.
    See if it heals if a short cord is put in the effect loop to jump it out. Could also be a cracked solder connection on an effect loop jack, but the effect loop contacts are open to the air and not the greatest metal, and unlike a proper switch, there's no wiping action to scrape the contact clean, just a pointy spot on some metal that touches when there's no plug in the jack.
     
  14. zanesaddiction

    zanesaddiction Tele-Meister

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    Thanks for being specific. I will check all of that first thing in the morning!! I will report back.

    There's not much out there on forums where the fx loop fails. Hopefully this will be simple...
     
  15. zanesaddiction

    zanesaddiction Tele-Meister

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    image-1792201896.jpg

    Opened it up, tightened up send/return jacks. I did notice white (looks like corrosion I 'rekon) blotchy spots on the solder for the send/return jacks. Sprayed with pot cleaner , rubbed with q-tip....

    BOOM! everything seems to be working...will test it out at a gig tonight...I'll keep a backup amp just in case . :)

    THANKS EVERYONE!
     
  16. Lucky Day

    Lucky Day Tele-Afflicted

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    Did you already buy it?
     
  17. zanesaddiction

    zanesaddiction Tele-Meister

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    No . He let me check it out first....what should I offer?
     
  18. zanesaddiction

    zanesaddiction Tele-Meister

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    I don't need it. I was hoping to fix it and flip it. Make some money.

    I have a dr. Z maz 38. Very similar amp and I like it better.
     
  19. Lucky Day

    Lucky Day Tele-Afflicted

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    I would expect to pay $600-700 for a near mint AC30, used.

    Given the problems this one has? I think $450-$550 would be a decent deal for him. I base that on knowing that the amp has some minor issues and that you already put some time into fixing it.

    Others may have a different opinion. I don't buy and sell amps all the time.
     
  20. Lucky Day

    Lucky Day Tele-Afflicted

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    If that's the case, offer less than $450 since that's what he asked. See if he'll part with it for $350 or $400.
     
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