Question about Fender Rumble 75 75watt Bass Guitar Combo Amp

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I bought the fender Rumble 75 bass amp about 0ne year ago and had no problems on switch on but recently there is this loud sound on switch on even with the volume and all controls turned down.Don't know if something is breaking down or not . The amp plays fine otherwise. Any help will be greatly appreciated.

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

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Obbie15
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SOURCE: Bass Guitar Keeps sound keeps cutting in and out.

ya... if moving the battery around helped then all ya gotta do next time the problem appears is change the battery, i would suggest changing it every 6 hrs youve had the cable plugged in and ALWAYS unplug the cable from your bass wen ur not using it, the battery is only active when the cable is plugged in. also make sure and play it often, although tht shouldn't be a problem, if you don't the battery will leak acid and destroy your pickups

Posted on Feb 11, 2010

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SOURCE: HI CAN YOU PLEASE TELL

A common reason for 'distortion' with all bass amps can be either that the screws holding the speaker unit to the cabinet have worked loose or that there has been a build up of dust particles in the corrugations around the edge of the speaker cone, which rattle especially on the lower notes.
The solution is simple - remove the front grille and check the screws are tight. Use a vacuum cleaner to remove dust from the rim of the speaker cone.

Posted on Feb 01, 2011

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SOURCE: Hello! I've bought a Fender Rumble

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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SOURCE: Fender Deluxe Active Jazz Bass buzzing when i don't have my hands on the strings

Try reversing the wires in your input jack. Please repost results. Thanks!

Posted on Nov 21, 2011

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1 Answer

Fender Deluxe Active Jazz Bass buzzing when i don't have my hands on the strings


Try reversing the wires in your input jack. Please repost results. Thanks!

Nov 12, 2011 | Fender Deluxe Active Jazz Bass Electric...

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Hello! I've bought a Fender Rumble 75 about 3 months ago and it sounded great really but after some loud playing (About 75% of max volume) it started to buzz at midrange notes, and its gets worse as time...


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.

Apr 23, 2011 | Fender Rumble 75 75watt Bass Guitar Combo...

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HI CAN YOU PLEASE TELL ME WHY MY FENDER RUMBLE 100 BASS AMP DISTORTS AT LOW VOLUME? EVEN THOUGH THE SPEAKERS IS NOT BLOWN


A common reason for 'distortion' with all bass amps can be either that the screws holding the speaker unit to the cabinet have worked loose or that there has been a build up of dust particles in the corrugations around the edge of the speaker cone, which rattle especially on the lower notes.
The solution is simple - remove the front grille and check the screws are tight. Use a vacuum cleaner to remove dust from the rim of the speaker cone.

Feb 01, 2011 | Fender Rumble 100 Bass Guitar Amplifier

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Hello ! Do You have shematic diagram for bass guitar combo Fender Bass Rumble 100 / 15 ? If You have it, please snd me on my e-mail ? Regards Zlatko


Try this link:http://www.fender.com/support/amplifier_schematics.php If your amp isn't listed contact them and they will send you one.

Oct 21, 2010 | Fender Rumble 100 Bass Guitar Amplifier

3 Answers

Bass Guitar Keeps sound keeps cutting in and out.


There is an inconsistency in your text. You indicate that cables were swapped and problem still existed...
You said:... "i have tried using it on a different amp and still fine".

If you tried it on a different amp and it was still fine then the guitar is probably OK.

THEN your amplifier is in question as the root of your problem.

What is the amp you have? The guitar is the CB-42, but what amp do you have?

MANY intermittent problems with amplifiers are often with the input jack itself. These jacks are easily broken by tripping over a cable plugged into them.

Jan 04, 2010 | Fender Rumble 100 Bass Guitar Amplifier

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For 100 watts it doesn't seem that loud to me. Could I maybe add more speakers (2x10s)?


Our human perception of loudness can be way off. You should get a soundmeter and compare. There are some pretty good ones on eBay new for about $140.

Adding speakers may NOT increase the sound much as the power will then be split between the speakers.

Nov 02, 2009 | Fender Rumble 100 Bass Guitar Amplifier

1 Answer

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

Feb 22, 2009 | Fender Rumble 100 Bass Guitar Amplifier

1 Answer

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


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

Feb 22, 2009 | Fender Rumble Series 100/210 100watt 2x10...

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