My JCM 800 Studio Classic SC20H. Crackles loudly when left with standby off


I recently bought a JCM 800 Studio Classic SC20H. I have taken in to practise twice and inbetween songs when i am not playing a loud crackaling comes out of the speakers (I have changed all cabels, speaker cable guitar cable power cable) and it still happends. but  if i play for a while it seems to disapear then randomly come back when i stop. if i put the amp into standby it goes.

anybody have any ideas?




asked 31 Aug 2019 at 11:05 AM

Rich Thomas-James
Answers: 1


Hello Rich,

As the unit is still under warranty we would recommend that you take it back to the dealer, so it can be checked over it may be a pre amp valve breaking down causing the crackling but we would recommend having it checked over.


Kind Regards

Marshall Support 

answered 02 Sep 2019 at 08:28 AM

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