GK Hisssssssssss !!!

Discussion in 'Amps and Cabs [BG]' started by Tom Neves, Aug 25, 2001.

  1. Just got a GK800rb off ebay. Nice amp and plenty powerfull for what I need it for.
    Problem is, it has a major hiss when I crank the treble up. Also the frequency crossover.
    I know some of the guys here use GK products.
    Is this common? The seller claims the amp is a little over 1 year old.
    What to do? :( :( :(
  2. EString

    EString Guest

    Nov 20, 2000
    Los Altos, CA
    I think if you really crank the treble up, any amp will generate some hiss.
  3. EString,
    What's really weird is that the hiss originally was extremely loud.
    When I turned her on yesterday I heard a loud crackle/pop and the hiss is more tolerable now.
    But it is still there.
    I borrowed a friends GK400RB and it is really quiet even with the treble cranked.
    Also forgot to note , the high speaker out only works when I play with the jack. Could be a loose wire or dirty connection.
    Thanks for the thoughts.:confused:
  4. HeavyDuty

    HeavyDuty Supporting Curmudgeon Staff Member Gold Supporting Member

    Jun 26, 2000
    Central Texas
    Dirty pots? Dirty jacks? Dirty jacks and pots?
  5. EString

    EString Guest

    Nov 20, 2000
    Los Altos, CA
    I think something is wrong with the input jack. I've seen something like this happen on another 800RB.
    Is yours pretty old?
  6. EString,
    Acording to the seller it's abour 1 1/2 years old.
    BTW, It's the speaker out, not the input jack.
    I think it may be loose.
    I will take it to a tech and let him have a look.
    I like the sound with my Ampeg cabs.
    Wondering what this will sound like with a EA 2-10?
  7. gfab333


    Mar 22, 2000
    Honolulu, Hawaii
    My GK800rb is eleven years old. the hiss is tolerable, it's not bad. I don't turn the treble up more than 2 or 3 o'clock. my cabs have horns. If you are running cabs with no horns and turn the treble up to 4 or 5 o'clock (that's actually on 10 right?), you can't help but have hiss noise.

    When the knobs start sounding scratchy, I open up the head and spray contact cleaner on all the moving parts, pots, and jacks. That usually clears things up.

    Just curious, how much did you pay for the head?