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Whats best settings for blues on clean and classic on overdrive channel for the mg250dfx marshall playing a g&l s500

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Posted on Nov 09, 2010

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I've had my Marshall MG250DFX for around 7yrs now at it has been gigged regularly throughout that time. It's been reliable up until recently. I'm now finding that getting volume on the clean...


Well without testing a bunch of parts. I would say some component in the clean preamp has changed. It may have happened over time and now you are noticeing it. without checking all the parts it would be hard to tell. Get it to a service center. Or you may send it in to Pro Line Music
215-736-8055

Jul 15, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

The treble knob for the clean channel broke off and now my clean channel doesn't work at all


Chaances are the potentiometer element was fatally damaged by the force when the knob was broken off.

You will need to have the unit serviced and getting the correct part is important to match the shaft, mounting, etc as well as the electrical characteristics.

The clean treble control is a 20K ohm, "B" taper pot (audio). ALL the signal for the clean channel goes through this so if pot is destroyed, clean channel will be dead.

Best thing is to call Marshall "parts" and get exact replacement. Note that sometimes the circuit board is cracked as a result of these accidents. This unit looks like the controls are VERY vulnerable to damage. I would make a cover to prevent damage from handling.

Another thing is to ALWAYS loop your guitar cable through the handle so tripping over it won't break the input jack which is a COMMON occurence.

Feb 07, 2011 | Marshall Amplification Marshall MG250DFX...

1 Answer

Hey, the clean channel on my Marshall 250dfx Combo amp isnt working the distortion and everything is working as normal, but the clean channel makes no sound at all, i was wondering if you can help?


The switching is done electronically by an analog gate chip. On IC9, check if the signal on pin 8 changes with switching between clean and OD... This is the actual signal that changes the gate. If you don't see a change there of say 5 volts, then the problem is in the circuits that drive this gate. If the signal is there, then the problem is in the clean channel audio op amps or the components around them. Let me know the results of the test.

Oct 18, 2010 | Marshall Amplification Marshall MG250DFX...

2 Answers

Ive just purchased a marshall mg250dfx amp and when i play the volume cuts down low and then back up again like its fading in and out every so often


Since you just purchased this, verify that your guitar and cables are good on another amp and if they are good, then exercise your warranty on the Marshall.

Connectors and cables for guitars are chronic problems so verify they are good to avoid looking foolish.

Jul 06, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

I've had my marshall mg 50dfx for 3 months and it doesn't sound right to me because the overdrive is just barely different to the clean channel and doesn't have as sharp as sound as other mg50dfx models


Play around with your placement and where you are compared to the amp. I have a line 6 spider jam and I was getting pissed everytime I went into guitar center b/c theirs had more bass than mine. Then I realized that I put the amp beside me when I play but I play infront and over it when I go there. Have you ever noticed how much gain you lose when you take it outside compared to in your room. I would just look up the owners manual and see if you are missing anything. Check the fuse in the back too. If you clean isnt "that" clean and your overdrive is sucking then maybe the fuse is on its way out. Only $1 problem though. good luck

May 09, 2010 | Marshall Mg50dfx 50-Watt Combo Guitar...

3 Answers

Marshall MG250dfx's sound fades out


I have read that the problem is in the FX send/return jacks which oxidize if not used much. All you have to do, apparently, is ram a jack plug in and out a bunch of times. This breaks up the oxidation, and allows the amp to work properly again.

Feb 26, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

Marshall MB 150 when on classic channel at 2.5 volume it emits a beat like a drum beat approx every .5 sec


There are a lot of reasons your amp could be "motorboating" That is the term given to a low frequency oscillation. Be it only a half second it is still an oscillation. Electrolytic bypass caps are suspect most of the time. I would highly doubt there is a feedback problem with the amplifier circuits due to the fact this probably just started happening. Grounding on power supply caps also can be a big suspect. There could be a cracked solder joint on one of those components that is causing a ground loop which in turn will cause your parasitic oscillation of a 0.5 Hz.

Dec 17, 2009 | Marshall Amplification Marshall MG250DFX...

1 Answer

One of My speakers does not work, When I switched the speaker wires the problem followed. I believe maybe a blown channel. """please help"""


Yes, one of the power amps has probably failed. If the channels are seperate, then another possibility is a bad input connector. These do get broken when cables are tripped over.

Nov 08, 2009 | Marshall Amplification Marshall MG250DFX...

2 Answers

Dead Clean Channel


This sounds like a thermal problem. You can often find the component by spraying suspected ones with circuit cooler, looking for a change.

Oct 28, 2009 | Marshall Amplification Marshall MG250DFX...

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