GK 400RBiii input jack issue

Discussion in 'Amps and Cabs [BG]' started by thunderlips, Jul 21, 2013.

  1. thunderlips


    Sep 7, 2009
    It gets a bit wonky to where I have to wrap the cord around the amp to get it to work. I've heard other players have the same isssue. Is there a relativley easy fix I could perform or should I have it sent to a repairperson ?
  2. skychief


    Apr 27, 2011
    South Bay
    You may consider upgrading to a standard Switchcraft input jack. A simple task for any amp tech.
  3. I would try cleaning it first. A Q-tip with DeoxIT or Rid-ox, rubbing alcohol if you can't get the right stuff. Do this with the amp unplugged and wait 20 minutes before plugging back in. If that does not work you could have a bad solder joint or worn out jack a tech should be seen to replace. Don't forget to use a rag and do the same to you instrument cable ends.
  4. thunderlips


    Sep 7, 2009
    Thanks for the advice. I got a new cab, Ampeg. PE1528.(\m/\m/) Previously I'd been using a Yamaha PA speaker. Now there are no input issues. I even tried jiggle the cord and still no noise. Switching cabs couldn't have any effect could it? I should add I haven't cleaned the Jack yet but will do so today.
    thanks again
  5. Take off the top cover and look to see if the jack is still completely connected to the pre amp board.
    If I remember correctly, it uses legs soldered directly into the board.
    This can't flex, if the cord gets jerked sideways or the head is dropped with the cord in it.
    I think I used a Switchcraft and just ran wires to the correct thru holes.
    It's been many years.