Question about Fender Rumble Series 100/210 100watt 2x10 Bass Combo Amplifier

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Fender Rumble 100 210 pop noise then hum after strong low e note

So the amp works fine most of the time but at higher volume and / or bass settings (bass knob way up) when I hit a hard low E, the amp pops once and the hums and makes some kind of descending cracle noise. turn it off and back on and its fine again. If I am gentle on the low E its fine (except for much higher volumes then E and A will do it)
I have also noticed that the power light seems to stay on longer and somewhat dimmer after this happens and after i throw the switch off.
Other than that, it works fine. Any ideas? PLEASE?

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  • rjivaro May 11, 2010

    Yes. There are 2 capacitors on the circuit board that need to be replaced. Fender installed them as part of the soft start circuitry that prevents a pop when you start the amp. Only thing is, they seem to drift off value and then you get the distortion when playing low notes. I can tell you reference number and value when I get the info at home and will post the solution at that time. I have the same amp. It took many an hour to figure this one out. You will owe me a case of bushmills black.

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  • Expert
  • 152 Answers

Replace C21 (10uF/50V) and C38 (2.2uF/50V) and it will work great.

Posted on Apr 30, 2009

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Fender Rumble 100 210 pop noise then hum after strong low e note


I just fixed my bass amp with a similar problem last week: the problem is related to a loose connection on the PCB board (likely).
A bass amp is a rough place for circuitry: the low rumble and power shake a bass amp more than a guitar amp.
In my case, the power transistors needed to be re-soldered and then the grounding bolts and screws needed to be removed and cleaned because the connection was bad. Remember that when two different metals needed for an electric connection are toughing, there is the likelyhood that corrosion WILL happen.
My bass amp did basically the same thing yours did: sounded good at low volumes, but at higher volumes it would act up.
In short, there is nothing you can do (unless you are a repair person): you need to take it to a local music shop and have a tech fix the intermittant contact problem: someone who knows what they are doing should only take an hour at most.

Hope that helps!
-mike

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