Glad you're still loving your Rumble! Exactly when does it rattle? When moving it? When playing it? Both? But, ... ...
A. I am not an amp tech myself, by any stretch of the imagination. And, ... ...
2. I am not familiar with your technical background and expertise, at all (no offense intended). Further, ... ...
π. "Adding things" to consumer electronics, even 'just' rubber washers, while seemingly harmless and logical, raises a red flag with me. Because it might, I dunno, insulate or compress 'something' not intended to be insulated or compressed and actually cause a worse problem (especially if I tried it)!
§. Since TalkBass has such a wide range of user resources, I would feel much better getting advice about your "rattling amp" in a combo from a very reliable technical source, such as @agedhorse..
hi G-Dog! So I had the issue with a rattling horn a while back and Fender replaced my amp without issue, not just the horn. I’m super happy.
now it seems like there’s a resonance on any C starting at the 15th position and 17th position on the high G string. The vibration can be heard through the front BUT if I turn the amp around, the fan vent rattles a LOT. If I pluck the string and then press on the amp where the fan vents are it immediately stops.
I tightened all the screws and made sure nothing I could see, without disassembling the amp, was loose. I feel like if I could put something on the body of the amp, or between the amp and the cab mounts and I could isolate it from vibration (at least somewhat) it would go a long way toward correcting the issue.
it isn’t a dealbreaker at this point as it only happens in the upper register and I’m rarely there. However, there are a few choice tunes we cover (I.e. Pink Floyd “Pigs” that requires playing in EXACTLY that position and the vibration wrecks the otherwise clean tone.



