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Post subject: Rumble 60 blown fuse?
Posted: Fri Mar 26, 2010 5:24 am
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So the other day I was playing my Rumble 60 bass amp, doing nothing real excessive (practicing with headphones and volume at a moderate level), and randomly, my amp made a horrible high pitched squeal and then died. Now, it will no longer turn on--the red power light does not light up when then power is turned on, and there is no indication that power is getting to the amp at all.

So I dig around on line, and all indications are that the problem is probably a blown fuse. Which should, in theory, be an easy thing to fix.

Except that the Rumble 60 bass amp has no accessible fuse. Or reasonable way to find an accessible fuse.

Is there a way to fix this without bringing it to a repair shop? I don't really want to end up paying 100 bucks to get a $200.00 amp fixed.


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Posted: Sat Mar 27, 2010 1:19 pm
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And--I figured it out. So in case anyone runs into the same issue (i.e. probably a blown fuse in a Rumble bass amp; if there is something wrong with the amp but there is still power getting to it, i.e. the red power light still lights up, the problem isn't the fuse. And if there isn't power getting to the amp, it still might not be the fuse), here is what to do. It seems likely that this voids your warrantee, so don't do this unless you are out of warrantee and/or are willing to risk accidentally doing more damage.

1) Unplug the amp. I mean, yeah, duh, but can't hurt to point this out.

2) Remove the amp box from the speaker cabinet. You need to remove 8 screws to do this, and none of them are the ones on the back panel (where the plug goes in) or the screws in the plastic corner protectors. Take out the 4 screws on the top of the cabinet that secure the handle on. Then take out the two screws at the front edge of the top (that have washers around them), and then the two similar screws on the back side edges of the cabinet box. Push the box out by pushing the front control panel in towards the back. There is a thin foil insulation inside the cabinet around the amp box that might get caught and make it tough to push out the amp box. And the wire attaching the amp to the speaker isn't really long enough to work with, so the box coming out is awkward and difficult to maneuver.

3) Find the fuse in the amp box. It is tiny and among the circuit boards and wires (it is a narrow glass cylinder with silver end caps less than an inch long). Pull out the fuse. Make sure it is blown (an unblown fuse has a really thin wire running down the middle of the glass tube; a blown fuse, not so much. And maybe some brown/grey burn marks inside). Get a replacement fuse (the Rumble 60 uses a 2 Amp, 250 Volt fuse. I got a pack of 4 at Radio Shack for 3 bucks). Put the replacement fuse into the fuse socket.

4) Put everything back together. More difficult than it sounds. It took me, like, 15 minutes just to get all four of the screws that hold the handle on top into the right place. The 4 screws with the washers (2 on top front edge and 2 on opposite side edges) are easier to get in, so do them first.

5) Plug in the amp and make sure it works. If the problem was a blown fuse, it is probably now fixed. If the problem was not a blown fuse, I got nothing.


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Post subject: Re: Rumble 60 blown fuse?
Posted: Thu Jan 20, 2011 9:13 pm
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4) Put everything back together. More difficult than it sounds. It took me, like, 15 minutes just to get all four of the screws that hold the handle on top into the right place. The 4 screws with the washers (2 on top front edge and 2 on opposite side edges) are easier to get in, so do them first.


hahaha I agree...I blew my fuse in my Princeton 65 DSP because I plugged it in the wrong voltage socket..its a 110 but pugged in a 220outlet...and I had to really spend sometime putting it back together..aligning the screws to the screw mounts is the hardest!...hey bakija, do you thin I should worry about some escaped electric current esacping and damaging some amp components?Im getting a bit too O.C. since this is my first real nice sounding amp...I hope I could just relax and just say "OH its just a blown fuse" and everything is protected..thanks....


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