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Message: <blockquote data-quote="JKD" data-source="post: 37264" data-attributes="member: 879">First guess would be that you dislodged something while cleaning..if you didn't remove the pre-amp tube covers (metal cylinders) then chances are it's not a pre-amp tube.Make sure the power tubes are all seated.Another place I'd look would be the output load (ohms) selector...make sure it's not 'inbetween' settings....other than making sure the cab is still connected to the Main output...can't think of much else externally.You could power off and pull the tube fuses..sometimes they go and no failure light....it's best to test them with a meter rather than rely on visual.</blockquote>