JCM 900 SL-X Only Works When Using FX Loop


I got a 1993 50 watt JCM 900 SL-X.  It works great except for that fact that there is no sound when FX loop is not being used.  I currently keep a cable in the loop and it plays fine.  Some people would recommend to do that any ways to improve the tone.  However, I want my amp to be in proper working condition.  Does anybody have any advice about what could be causing this?  I am not qualified to do serious amp work, but could this be something minor enough that an unskilled person can fix it on their own?

asked 11 Apr 2018 at 06:43 PM

Justin Coleman
Answers: 1


Hello Justin,

Regarding your JCM 900 SLX it sounds as though the effects loop jack socket may be faulty, we would recommend that you have it looked at by a qualified engineer.


Kind Regards


Marshall Support

answered 13 Apr 2018 at 07:27 AM

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