no, no fuses ,just tubes! if i remember correctly,which i often do not,it was doing this the lastime i had it worked on,and the dude that worked on it,whos name escapes me at the moment,couldn't find a problem. seems i need a second opinion! it has been fine the last couple times i played it,then this morning(i'm a bad neighbor!) it strted poping and i shut it off before it could blow anything. i am at a loss. as far as i know, nothing was changed the last service,just a couple loose connections tightened. i did have the plug end of the power cord changed,because it wwas knarly and wouldn't stay plugged in without being taped ! i will definatly try the copper caps,sounds like a super sweet soulution. at this point i will try anything to make this head more reliable. i been looking for the fella ed was talking about,but with no luck. i really apreciate all the help and sugestions,thanks alot fellas!