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GT Brick problem...cuts out and gain VERY low

Discussion in 'Pro Audio Equipment' started by JLiRD808, Dec 14, 2010.

  1. JLiRD808

    JLiRD808 Active Member

    So Ive had this problem awhile but it comes and goes...but Im sick of it now.

    I usually have to have it cranked up to max gain or just below to get any decent signal. Also, it seems to just cut out every once in awhile. To get the signal to come back in I sometimes unplug and plug the mic back in...Ive even got the signal to come back by whacking the mic (an old mic lol) against something or screaming REALLY LOUD into it. I know that sounds crazy but its fkn true...I was hoping it was just the bad mic but its all my mics.

    Is it maybe my mic cable? Do I have a tube or something out or loose in my Brick? Dont know much about tubes so any help would be most appreciated.

    Also, I found a similar posting on SOS forums...I dont have a membership so I couldnt comment though. There didnt seem to be a clear solution.

    Forum - GENERAL DISCUSSIONS : Music Recording Technology

    THANKS!!!
     
  2. hueseph

    hueseph Well-Known Member

    Probably a cold solder point but it sounds like there might be something else. A capacitor going? How old is this preamp? At any rate the fortunate thing is that the Brick is made with decent components and they aren't micro sized so, it's easy to work with. IE: it's repairable. If you know of a decent electronics repair shop I bet they could fix it for you without a lot of trouble.
     
  3. TheJackAttack

    TheJackAttack Distinguished Member

    That's a capacitor somewhere in there getting ready to go. Open it up and look for the one or two that are swollen.
     
  4. JLiRD808

    JLiRD808 Active Member

    Thanks guys! The Bricks about 3 yrs old...its been acting this way for about a year though.

    Are u saying that if its a capacitor a basic electronics repair place could do it...not just an authorized GT repair place? I just google imaged what a swollen capacitor looks like (no electronics background) and will try to open it up and look tonite. I'll post a pic if Im unsure. I should just be able to replace that with another one from Radio Shack or something right?

    And also...just to double check...Im not supposed to touch the tubes without gloves right?!

    THANKS AGAIN!!

    btw...it was working great last nite...for about 15 mins then plagued me the rest of the nite until I gave up.
     
  5. fiddler59

    fiddler59 Active Member

    I have been having the same problem with my Brick. I just gave up and stuck it in a corner. I have a Hamptone HVTP2 tube pre now and I am much happier......plus if something goes wrong it is infinitely easier to trouble shoot. I much prefer the sound of my Hamptone plus it has a lot more gain than the brick. It is more expensive but on a per channel basis it is not that much more expensive.

    David B
     
  6. Link555

    Link555 Well-Known Member

    if you want to mail it, send it my way.
     
  7. Link555

    Link555 Well-Known Member

    And Huesph through hole !=(does not equal) easy to repair.
    I like SMT better ;)
     
  8. JLiRD808

    JLiRD808 Active Member

    LOL I have no idea what this means...was this meant for me? Also, u serious about me mailing it to u or u kidding? Im sorry Im kinda new around here...THX!!!
     
  9. Davedog

    Davedog Distinguished Member

    Link will fix it. He builds all kinds of things with squiggly little parts in em...... ;]
     
  10. Link555

    Link555 Well-Known Member

    squiggly I like that...yep I can take a look at it no problem. I am in Canada though...the shipping is always interesting these days. Next time I am in your neck the wood you'll owe me a beer and some surfing ;)
     
  11. JLiRD808

    JLiRD808 Active Member

    Can I get ur address? Feel free to PM me...I opened it up but cant see whats going on lol...I see a very faint orange glow in each tube and thats it.
     
  12. hueseph

    hueseph Well-Known Member

    No. That was for me. Fortunately I'm not an electronic engineer or a hobbyist. I know how to build a distortion pedal that will blow up your amp though. If you're at all interested in that. Sounds great for about five minutes until the smell of smoke then the pop. After that there's no sound at all unfortunately. If I could only get an impulse model of those few minutes it would be awesome!


    Yes. I'm kidding but no. I'm not kidding.
     
  13. BobRogers

    BobRogers Well-Known Member

    Not to deprive hueseph of any work, but there is bound to be someone in Honolulu that works on tube amps - consult your local music store - and it is in your interest to keep that person in business.
     
  14. JLiRD808

    JLiRD808 Active Member

    livin in cincinnati now :mad:

    I'll contact the local music shops to see if they can help me find a local specialist in tube amp repair...that or Google. Still waiting to hear from Fender Consumer Relations too about a local tech.

    Thanks guys!!
     
  15. Link555

    Link555 Well-Known Member

    Ok the beer offer stills stands, but I am not surfing in Cincinnati
     
  16. mdb

    mdb Active Member

    If you haven't yet, at least try swapping out the mic cable first. It may be the preamp as mentioned, but wouldn't you hate to find out later it was some stupid cable?
     
  17. JLiRD808

    JLiRD808 Active Member

    UGH....I still have this problem after getting the tubes replaced, the pots cleaned, and replaced the XLR input with a Neutrik. I also made sure that it's not the mic cable and have now noticed that the 1/4" input cuts out too....ie guitar/bass.

    Back to square one I guess :mad:
     
  18. hueseph

    hueseph Well-Known Member

    So, you took this to a qualified technician and they couldn't figure it out? I would bet that it's one of the capacitors going or gone.
     
  19. JLiRD808

    JLiRD808 Active Member

    Yeah I took it to Buddy Rogers Music repair guy. Theyre a Cincinnnati only music store chain...maybe not the "most reliable". We've got GC's here too...I could try them or just some electronics only spots.

    I hope its capacitors...is there a sure fire way to check? Do they have to look swollen to be bad? They all kinda LOOK ok...but Im not an electronics expert.

    THX!!!
     
  20. JLiRD808

    JLiRD808 Active Member

    Also, when it cuts out, a lot of times I can get the sound to come back when I unplug the XLR input and plug it right back in....weird right?!
     

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