Question about Fender Rumble 100 Bass Guitar Amplifier
I got a rumble 100 that cuts out when hitting low end notes every time, Starts out with some crackling then sound subsides. The amp stays on, red light indicator stays on and red lights at the bottom also stay on when switch is on from the back of amp. If I connect via cd input jack and play something that has low end same thing happens, only time amp performs as normal without any cut out is when I have headphones plugged into it. Any help would be greatly appreciated, thanks in advance.
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Posted on Jan 02, 2017
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!
Posted on Mar 31, 2009
Suspect the input jacks. Wiggle them and see if you get anything. They get yanked sideways because the musicians don't loop their cord thru a handle and they get yanked sideways.
Also you can try spraying sparingly CRC226 into the switches and pots. You can get it at Home Depot in the electrical department.
Posted on Oct 10, 2009
Here is the schematic:http://www.fender.com/support/amp_schematics/pdfs/Rumble_Bass_Schematic_-B21.pdf Check the tubes to see if one is loose in its socket. Do not attempt to repair this yourself unless you have amplifier repair experience as it is easy to get a bad or life threatening shock without the correct test gear and troubleshooting procedures.I hope this helps.
Posted on Nov 26, 2009
Try plugging another sound source into the unit. The buzz MAY be pickup of magnetic fields in your guitar pickup that clobber your notes from the strings. Bad guitar cables are another possibility. By putting clean music from say a CD player into the unit you can find where the source is. If the CD player generates the same noises, then likely you have a failure of filter caps in the amp or other component failures. Also make sure your guitar can't "hear" the amp as feedback can do strange things.
Posted on Apr 23, 2011
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