Question about Fender Rumble 75 75watt Bass Guitar Combo Amp

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I have a humming sound in the bass amp is a fender rumble 75w.

So when I connect any bass, buzz is permanent. I did the test with the aux in and also makes. When I connect headphones everything sounds good! If any can help me, would be very grateful.

Posted by Anonymous on

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Posted on Jan 02, 2017

  • 11 Answers

SOURCE: Fender Hot Rod Deluxe making popping noise

Ah yes, the Fender Hot Rod Deluxe. I have seen more of these in my shop than any other amplifier!! I have even sent recomendations for design changes to Fender about this amplifier.
Sadly, your amp tech may be correct: while the amp is within working specs, you can still have an issue with a bad socket. The cheapest thing to try is to replace the preamp tube(s) you think may be causing the problem. If the problem persists, it may need to be serviced on this issue (by a different 'certified Fender tech'). In defense of the last tech you had work on this amp, these amplifiers have a brittle design and do not gig or travel well (there are a minority of these amps made that do perform). Fender tried to do too much for the price on this model: best advice is to fix it, sell it and get your tone with a more stable model made by Fender (like the new vintage re-issues). Fender, like Marshall, has for years been having problems when they get too far from thier 'working reciepe' of what made them great companies.
You likely have a socket that needs re-tensioned, or a preamp tube not behaving. If it is not these, then a tech had to dive in the house of cards that is this circuit. Sorry for the bad news on this, but it is the truth. I only take on Hot Rods that 'appear' to be fixable. I am a development engineer, build amps from scratch and fix them for the local music shops, and my success rate is a dismal 60%-ish percent on these...
Thanks,-mike

Posted on Mar 30, 2009

  • 11 Answers

SOURCE: 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

Posted on Mar 31, 2009

  • 153 Answers

SOURCE: 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.

Posted on Apr 30, 2009

  • 1137 Answers

SOURCE: My Fender Rumble 25 makes a terrible crackling

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

  • 1 Answer

SOURCE: I am having trouble removing head from Fender

I just removed the head from a rumble 100 I just got yesterday, you have to remove the 4 screws in the top, then the four that hold the handle on the top, and also the two from the sides. Slide the head out the back, but be careful of the wires attached so you don't rip them out (they are sort of short). Also be careful not to touch any electronic parts on the boards, some are extremely high voltage and can electrocute you (even when the amp has been unplugged)

Posted on Mar 31, 2010

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My rumble 30 bass amp makes a lot of bad noise when i plug it in. it started off when i first started playing it and it worked fine, then after a few minutes it started making the noise. i've tried...


How new is the amp?

A single faulty solder can do that...I'd try returning in to the seller.
Have you tried a different amp with the same equipment?

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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.

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There is a noticeable ringing sound only when I strum any note on the E string , any other string sounds fine.


If the ringing only occurs with a specific range of notes it may be something rattling in the amp loose or speaker enclosure.
It could also be feedback occurring at certain frequencies - does the ringing stop if you turn the volume down a bit or stand in a different position in relation to the amp?
Could be a problem with your guitar? Maybe the pick up height needs adjusting in relation to the E string or is it the string buzzing against a fret - indicating a need for adjusting the bridge height or trussrod settings?

Feb 27, 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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Having "hum" problems when connecting


Verify that your CD equipment is powered from the same receptacle. Check the audio cables as boken shield would be a common cause of hum.

Dec 18, 2010 | 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

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My Fender Rumble 25 makes a terrible crackling sound when the volume is turned up over the 4 or 5 mark. I don't think the speaker is blown as the same sound comes via the headphone socket.


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.

Nov 26, 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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