JJ Impedance Selector Knob Problem

  • Thread starter Thread starter DistortED
  • Start date Start date
DistortED

DistortED

Well-known member
Hi,
Had a question for Dave. I was setting up my JJ through a new cab that is an 8 ohm. I usually run a 16 ohm cab. When I went to switch the impedance, the knob just spins and does not click. This is the first time I have switched it. Does the knob have to be replaced ? I am not the original Owner so who knows what was done before. Just seems odd never had that problem before.
 
marshall2553":2n1x3pof said:
Does it have the same knob as the SmallBox? A few of us are having the same problem.

viewtopic.php?f=57&t=171442
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Hi, yes it's the same knob. It just spins makes 2 clicks every once in awhile, then keeps spinning. I don't even know what Impedance it's in now. So I am not going to play it till I can figure a way to fix it.
 
Loosen the set screw, remove the knob and turn it by hand or with some pliers. Click to where you know it's on 4 or 16 and put a line on it with a marker so you can always tell where it's set. Or just tighten the set screw and see if it holds.
 
marshall2553":2nuwecz6 said:
Loosen the set screw, remove the knob and turn it by hand or with some pliers. Click to where you know it's on 4 or 16 and put a line on it with a marker so you can always tell where it's set. Or just tighten the set screw and see if it holds.
Click to expand...

Thank you will try it. I'm hoping there is a fix to this soon, would prefer to have the knob working properly.
 
marshall2553":1rlm9zpq said:
Loosen the set screw, remove the knob and turn it by hand or with some pliers. Click to where you know it's on 4 or 16 and put a line on it with a marker so you can always tell where it's set. Or just tighten the set screw and see if it holds.
Click to expand...


Problem solved !!
20150910_161518.jpg
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Just replaced the two back knobs with some Marshall Gold Tops. Works like a champ now. Those OEM Knobs are to weak for that switch.
 
Hmm, I think I have a few of those in a drawer somewhere. I'll give that a try when I get a chance. Thanks!
 
I'm surprised Dave hasn't chimed in to help with this.
 
It's the knob. We are sourcing new ones for the impedance position.
 
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