I have noticed that my amp has a rattle sound when the volume is set to a moderate/high level.  It also happens at much lower levels if I use the crunch  or higher setting.   It sounds just like a tube amp with a bad tube.
My amp is out of warranty.  I initially thought it might be a bad speaker.  Of course I wondered why it would be ripping since I rarely tune the amp up real high.  But in the interest of verifying, I changed the speaker to a Red Coat series Tonker.  The rattle is still there but DAMN this amp has one hell of a full sound now.  I have thought from the beginning that this amp sounds a bit thin.  Not now, this thing sounds like my Carvin X100B.  Talking about sound with body!

Anyway... I decided to tighten all screws etc. that I could access in hopes that it was a jingle I could find.  The sound reminds me of keys jingling or something similar.   Snugged every screw I could find but still got the rattle.

I pulled the head out and snugged all the screws I could find inside, still got the rattle.

Next I am going to hook the speaker wires to an external speaker box to see if the jingling is still there.  If the jingle goes away I will know there is something loose in the case.  If the sound is coming from external, I will know the problem is with the electronics.  In which case I guess I am just screwed.  Gotta tell you, I am really going to be disappointed if there is an electronics problem because I already gave up on my Fender FM212R amp because of electronics problems.  I switched to Line6 because I figured I was moving up.  Hope I was.

Have any of your had a similar rattling issue and if so, did you find a cure?

Thanks for your time.

Jeff