Question about Marshall Amplification Marshall JVM410H 4-Channel Guitar Amp (with Footswitch)

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Marsahll amp jvm205c has static/hum in overdrive

Everything functions well until you go to overdrive made and a static then hum condition occurs.

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KORG CX-3Combo Organ


DSP is Digital Signal Processor.\\
That is electronics and would have to be serviced by the company or authorized service centre

Sep 17, 2016 | Music

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I have a Fender Precision Bass Guitar serial #503122. I'm curious about its age and value? It is in excellent condition.


this should be a 1960 bass and there was 18,000 of them made so it is not rare but the questions that must be asked to put it in the rare category is the bass 100% original = this means everything /pots /pickups /tuners /frets /finish and then the overall functioning of the parts EX. bent tuner that turns restricted causing tuning problems / pots that cut out / input jack that's screwed up / buzzing or severely worn frets /and or fret board wear /worn finish on the body/neck so you must go down the list of everything to come to the overall condition of your bass then you can grade it by it's condition and then see where the basses category is (PRISTINE) =never used still tags & case (fine) = slightly used tags & case (excellent)= used but no finish chips scratches everything original & working so you get the picture I am curious about this because most players know there basses very well so this tells me that you have acquired this bass recently or that it belonged to a family member? and was passed down to you post back with more info/pictures of the bass I'd like to see it Stephen

Sep 30, 2014 | Fender American Precision Bass

1 Answer

Fender Passport pro 500 - speaker static temporary, then goes away. Usually occurs shortly after turning system on.


If this system is still under warranty get it to a warranty service center. This is an early stage symptom of failure with the Power Amp IC. Fender has a good warranty policy on this stuff - 1 to 3 years

If not under warranty you may want to wait until it the problem is more persistent - easier for a tech to fix - unless it IS every time right now. A good tech can identify the issue quickly once "on the bench". My 'gut' feeling is the Power Amp IC when the system is first energizing to full stable power.

Oct 26, 2013 | Fender Passport Deluxe 500watt Sound...

1 Answer

I HAVE A NUMARKKMX01 MIXER WHEN I PLUG THE RED RCA JACK IN TO THE MIXER I GET A LOUND HUM


What is plugged into your Numark mixer when this happens? Try disconnecting ALL audio inputs to your mixer, turn mixer volumes to zero and see if the hum is still present. Adjust the volume and check if the hum you mentioned returns. If it is still heard, try new cables between the mixer and amp...if not then start reconnecting inputs until the hum is heard again. It's a process of elimination but not that difficult to find the source of your problem.

Oct 31, 2012 | Numark Industries Numark DM 1200 Mixer

1 Answer

SX BA1565 amplifier - loud hum when powering up. No amplifying function with an input - hum all the way!


Power amp chip or transistor has shorted to one of the power supply rails. Do not use until repaired as it is likely driving high DC current into the speaker.

Aug 26, 2011 | Sx Guitars SX BG1K 3/4 WT White Bass...

1 Answer

Presonus keeps freezing (does not switch off but no sound is heard through the FOH & Monitirs) every 15 to 20 minsutes


Just getting one of these... hope mine doesn't do this... However I can offer some suggestions to check that you have obeyed the rules of proper connection of music equipment to avoid noise and damage that can occur. FIRST... ALL and I mean ALL interconnected equipment such as amps, mixers, players, and computers, etc. need to be powered from the SAME receptacle or power conditioning module, even if it means running power extension cord. AVOID static discharges to any connected part such as mics, computer, etc.. These can often freeze equipment even though you don't feel the spark. Without knowing your particular setup in detail myself nor most helping people will not be able to offer much more help.

Aug 01, 2011 | PreSonus StudioLive 24.4.2 Digital Mixer

1 Answer

Hi there, i got a 5150 half stack amp and the evh wah pedal, my problem is when i engage the pedal comes a terrible hum, i already change the cables, 9v battery and the ac adapter and the big noise...


WHY are you using a battery AND a 9 Volt adapter? This is an either/or thing. Chances are you have a defective ground someplace. Use just the battery and try it... If the hum is gone, the adapter is NOT compatible with the pedal. A lot of hum problems occur because the guitar is near a source of magnetic fields, such as an amp. An embarassing thing is for a musician to reverse the in and out connections to the pedal... it will have the symptoms you have mentioned.

Apr 24, 2011 | Dunlop EVH Wah Wah Pedal Wah

1 Answer

The amp plays fine for about 15 to 20 minutes, then an extremely loud, over powering hum/buzz takes over, and then the amp has to be turned off, but the problem persists. I've tried several guitars,...


You say the "tubes are fine" I take it that you have either replaced them with new or used a very sophisticated tester on them. A heater-cathode short might cause the symptom. There are a bunch of tests I would want you to run alnd get back to me with the results.

Heat up the amp but DO NOT play anything into it for the usual failure time or more and they start to play i... did hum occur WITHOUT playing? With all volume controls down does the hum occur?

The right tools is an oscilloscpe to fing out if the filter caps are good. These are C31, C33, C35, C36.

With hum present in failed stater, plug in a grounded plug into the power amp in jack... if hum is stiil there, check the +/- 16 volts regulating Zener for ripple. get schematic here:

http://elektrotanya.com/fender_hot-rod-deluxe_sch.pdf/download.html

Jan 29, 2011 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

I've had (i don't know the model) a marshall 4 way foot controller (1.Clean/crunch, 2. Overdrive/clean overdrive, 3.Tempo, 4. tuner) for about 2 years now. Its been working fine untill i tried to plug it...


Make sure the pedal and the amp ae compatible. MANY pedals can only be used with one type and model amp. If this was used with a different model amp originally, it is probably incompatible with the ine you are trying to use it with now.

Jan 22, 2011 | Marshall Amplification Marshall PEDL90008...

1 Answer

Deville 212 overdrive channel making Loud humming noise


It sounds like a filter capacitor(s) has failed. The electrolytic caps dry out and cease to perform allowing unfiltered power to reach the preamp sections and get amplified.

Being this is tube with high voltages, an experienced person should work on it due to shock danger.

I assume you checked the tubes for shorts as well as emission since a heater to cathode short could cause this as well.

Sep 30, 2009 | Fender Hot Rod Deluxe Guitar Combo...

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