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So we have an old ungrounded mixer.

Discussion in 'Miscellaneous [BG]' started by darkside 88, Aug 27, 2005.


  1. darkside 88

    darkside 88

    Feb 23, 2005
    Bay Area, CA
    I reached for the mic, and holding my bass, INSTANT CURRENT through my arms.
     
  2. My former guitar player had an old Ampeg combo guitar amp, and it wasn't grounded. Two prongs only, so it didn't matter if he put it in the "right" way, he got shocked whenever he touched the metal pole to his back...
     
  3. darkside 88

    darkside 88

    Feb 23, 2005
    Bay Area, CA
    This lasted for like, 10 seconds...my shoulders hurt now. ;_;
     
  4. bigbajo60

    bigbajo60

    Nov 7, 2003
    Laredo, Texas
    Back in my High School days (when dinosaurs like Foreigner, Boston and Kansas rocked the land... :smug: ), I was the bassist in the school's Jazz Ensemble.

    One performance saw us set up in the grassy back yard of a wealthy school alumni for some hoity-toity black-tie event. Well anyway, we were setting up in the 'recently watered' grass, and the Band Director asks me to sound check a mic.

    *********
    :confused:
    *********

    Next thing I know, I'm lying on my back, my bass still in playing position, and the rest of the Ensemble is gathered around me like they're at my wake! Seems that when I went to check the mic, all they heard was a big "POP", saw a bit of blue light, and saw me sort of kick back from the mic and fall to the ground. No injuries to speak of, and the show did go on, but for the next few days I had a pervasive metallic kind of taste in my mouth.

    The lesson I learned at that tender age?

    Grounded electricity rocks! :D

    Ungrounded electricity sux! :mad:

    School Band Directors who make their students check the sound systems supersux! :p
     
  5. WalterBush

    WalterBush

    Feb 27, 2005
    Yuma, Az
    Grounding won't necessarily help. In extreme cases, it can make the problem worse. Two circuits, grounded, that have a voltage differential between them will still shock you. PA plugged in one circuit, amp in another, and zap! could happen anyway, ground, no ground, whichever.


    I've been shocked repeatedly--the worst case was when someone replaced the plug on my Bassman. They got the ground and neutral reversed, and I grabbed a barrel-type transformer I was using for a DI at the time which was connected to my church's house board. Zap!! No one in the room believed I was being shocked, this must have gone on for minutes before my father finally stopped laughing and killed the power.


    Most of the shock incidents since then have been as a result of me being an electrician :D . I never seem to get tired of telling non-electricians, "Don't worry, it's only 120 volts. You'll be fine."
     
  6. bigbajo60

    bigbajo60

    Nov 7, 2003
    Laredo, Texas
    So the lesson I learned at a tender age sux too?

    :meh:

    That sux.

    :D
     
  7. fenderx55

    fenderx55

    Jan 15, 2005
    NYC/Queens
    my bandmates and I all learned very early on in our "career" that the room we practice in is NOT grounded and we are NOT to grab the mics while holding our guitars.
     
  8. Petebass

    Petebass

    Dec 22, 2002
    QLD Australia
    All Rights Reserved © 1996 Duncan Fry (well know Sydney sound engineer and live sound journalist. I love the way this guy tells stories, and ths one is relevant.)

    "I was away doing a two week country mini-tour, through the backblocks and with a couple of snow gigs thrown in for good measure. As usual on these things we were running late. Dick Turpin (not his real name, but what he was paying me was Highway Robbery!), the tour manager, used to fret so much that we nicknamed him ‘the Road Worrier’.

    Although he was a likeable enough guy, he suffered from the short-sightedness that affects all tour managers, never allowing enough time for the crew to sleep and/or eat. Plus, he could never work out why it took a heavily laden 7 ton truck longer to get places than he did cruising around in his V8 Commodore.

    He had worked out approximate times and distances from gig to gig by using a map only, and arranged the schedule on the worksheet accordingly. Unfortunately on this particular gig, what had seemed quite a short distance as the crow flies on the map had certainly turned out to be short, but mostly vertical, through a whole chain of mountains.

    Very few things go up the side of a mountain slower than an overloaded truck, and what with the obligatory stops for hamburgers and leaks, our arrival at the gig had been several hours later than planned.

    I had my trusty helper Jim with me, and the band had Bill, a lighting guy with his own lights rig who also did stage. Since we were in such a rush I got Bill to run out some power cables and speaker leads for us while he was setting up the lighting, and we put the stage gear up for him as we organized the PA.

    Now, I don’t want to say anything bad about lighting guys, because some of them are almost human, but this guy’s knowledge of the correct AC power lead wiring was non existent.

    Each night he would be wiring up his lights, and there would be sparks and crackles coming from the connections, and I’d hear him saying “Ouch - $#@$ - Oww!” and so on as he plugged on (Pun intended). Still, as long as he confined himself to lights and I didn’t have to touch them, I didn’t worry.

    The support act for this gig was a reggae band. Not what you’d normally expect in a country town, but this business can always surprise you. It was led by a black guy in full rastafarian getup - dreadlocks, striped African robe and knitted beanie. He did none of the work, but simply roamed around the place while we set the system up, getting in the way and saying “Yah, mon,” in a strong Jamaican accent and generally giving us all the poops.

    Our band had a Yamaha CP-80 (even bigger than a CP-70) piano which we had to lug everywhere. The band liked it because it sounded just like a concert grand piano. Only trouble was, it weighed just about the same as a concert grand! No kidding, the thing weighed 250 kilos; I know because it was stencilled on its 2 cases! It was no fun lugging that up 4 flights of stairs.

    Anyway, Ron Rasta from the support band was raring to go, and hanging round the stage ready for his soundcheck. As soon as he heard some taped music coming out of the wedges, he rushed up to the lead vocal microphone, put his mouth around it and started to say “Check, mon....” in his strongest Trenchtown accent. A crackling sound ripped through the PA, his dreadlocks stood on end, and he leaped away from the microphone as if he’d been hit in the forehead with a sledgehammer.

    “Aaaah, the @#$$n’ thing’s live, aaah, me mouth” he screamed, staggering around the stage clutching his lips. No longer did he sound like Bob Marley’s twin brother, though. Now he had one of the broadest Aussie accents you’ve ever heard!

    I ran down to the amp rack, turned them all down and shut the power off, not wishing to kill the guy even though he was a real pain.

    I looked at the power lead running from the wall to the FOH amp racks. It had a tag on the side of it that read: ‘Sparkies Concert Lighting.’ In the rush to set up, Bill the lighting guy had used one of his own leads to power up the PA system.

    I didn’t dare have a look inside the plug to see what the wiring looked like, but just yanked it out and threw it in the corner, then went looking for my super heavy duty special mobile home yellow power lead. I found it nestling in the lighting rig somewhere, retrieved it and got on with the soundcheck.

    Ron Rasta was much subdued after his practical demonstration of troubleshooting grounding problems, and we never heard him say “Yah, mon” again. Nearly having your mouth arc welded shut tends to really focus the mind.

    Of course we all knew that it should have been Bill the lighting guy who had the near death experience, so later that evening Jim and I gave him some helpful advice on wiring techniques, which colour lead goes to which pin, and why the green one is very important if you want to stay alive."