Rebel 30 Owners - Problems with cabinet buzz?

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danelectro

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My Rebel 30 112 combo has acquired a very loud buzz that gets particularly loud around an octave A note (110 Hz). Does anybody else have this problem? The cabinet was relatively quiet when I initially got the amp (although the tube rattle was quite audible), however after about four weeks use this annoying buzz showed up. I pulled the chassis to see if any of the screws had vibrated loose which they hadn't. I did go ahead and snug all of the screws a bit and put it back together. It quieted down for awhile, but now the buzz is back again. I suspect it might be coming from the vent grill on the top of the cabinet. When I touch the grill, the buzz goes away, although pushing anywhere on the cabinet can cause the resonating to stop also. The handle isn't the source. I guess I'll tear the cabinet apart again and either put a gasket behind the grill or remove it altogether. I should probably put gaskets between all of the components.

I'm just curious if this is a common or if I have a unique problem here. I'm in love with the tone and versitility of this amp and I like the portability of the combo, however if I can't cure the problem I may be forced to go with a head/cabinet setup.
 
It could be a Power Tube (failure)problem.If you can check with another cab..you'll know for sure but it reminds me of a similar experience i had and it was just a bad power tube..Anyway,always follow Bruce's advice :yes: !
 
Problem fixed. I intially thought it was the top vent buzzing so I disassembled the amp so I could put a foam gasket under it. To my surprise there was already a gasket there. I went ahead and replaced it with 1/16" thick foam with double-sided adhesive. I put the amp back together and found that the buzz was just as apparent as ever. Next I put a capo on my guitar and cranked up the amp to get it to feedback at the frequency causing the buzz, which made it easier to try to pinpoint the source. As it turns out, the vibration was coming from the gap between cabinet top and the chassis where it mates in the area of the controls. I could feel quite a bit of air moving through the gap. I disassembled the amp once again and put a strip of the 1/16” foam tape along the underside edge of the cabinet. There’s not much overlap between the cabinet and the chassis in this area, but its enough to buffer the gap. As I tightened the chassis screws I pulled the chassis tight against the cabinet top to make sure the gasket was well compressed. This cured the buzzing completely.

EgnaterRebel30026.jpg


I had initially emailed Nate and John at Egnater about the problem and I want to thank them for getting back to me promptly with suggestions about what to try. Apparently this is not a common problem. In the case of my amp, I guess the fit tolerances just happened to go in a way that it allowed for a gap that would resonate at certain frequencys. BTW, I'm impressed with how well this amp is constructed. There are gaskets in between just about every mating surface of the amp. Most all screws are machine screws going into t-nuts. All of the circuit boards are double-sided boards with plated through holes (which are much more reliable than the typical single-sided boards found in amp in this price territory). Overall, excellent construction and excellent tone. I've owned several expensive boutique amplifiers and I'm happier with the tone and features of my Rebel than any of them.
 
Interesting experience and picture !I'm happy to see the Rebel30's back !Well done! Edit:i see you also have the Rebel20;is the R30 really louder (more powerful)?I would like to know esp. for the clean sounds.Are they very different ?
 
I am having the exact same issue. Any chance for a step by step on disassembly to get to the Chassis? Remove all the screws in the back?

Sincerely,
Colin
 
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