Question about Marshall MG10CD 10 Watt Combo Amplifier

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When i press the distortion button, there is no sound. if i fiddle with it it gives sound, but i need to hold it in a certain position. clean works fine

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  • Marshall Master
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Either the button is defective, or there may be bad soldering or a crack in the circuit board where it mounts. You will have to open the unit to repair it.

If you don't find a crack or bad soldering, try to spray a little CRC226 into the switch portion of the button. This is availablle at Home Depot in the electrical department.

Posted on Jan 03, 2011

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Marshall MB4410, with low volume gives no real volume,


Guitar amps have preamp sections (think unpowered audio mixer) and power amp sections (Crown rack-mount amp). An excellent way to isolate audio problems if amp is still producing audio is to check the preamp out (line out). Preamp output distorted = preamp failure. Connect MP3 player to "Power Amp In"...sound distorted = power amp failure. In your case the latter is the case as your "line out" is clean. Also test each speaker for clear sound as speaker cone damage from being overpowered is fairly common. At 300w. I'll assume the failure was not from cranking the volume to loud but a shorted speaker or speaker wiring could zap the power amp in an instant.

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How can i get more metal distortion from my peavey 6505+ 112 combo amp?


Tone is a hard thing for some to achieve. Kinda sounds like the amp isn't satisfactory to you as a player. I use an ADA MP-1 with a quadraverb GT and I can sound like Steve Vai with almost any amp. The pedals you mentioned should all sound pretty good with almost any amp. You kinda sound as if your amp sounds wimpy. ALSO, a good metal distortion is a combo of effects as well as tone(layering). The sound you may be expecting may be the sounds of 4 effects combos at a time through a line mixer making it all sound like one sound. I use rack stuff BECAUSE I can get the sounds that NO pedals can give. This also sounds like your knowledge of the equipment needs improvement. True tweaking of gear takes years to perfect, especially if you're a picky guitarist like myself.

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1 Answer

Just installed my new bridge with piezo pickup and my 1/4 inch jack lead will not go into the jack mount on my fiddle. After about a cm in it just stops and wont go any further! Would appreciate any...


I hate to say it but you probablly need a bigger hammer... grip the jack, not the fiddle, and put more force on the plug... they can initially be tight... I do NOT like carpenter jacks myself. They are too heavy. At the 1 cm point is where the plug has to displace the contact. Expect to put 1 to 2 pounds of force to get the plug in... SUPPORT the jack so the force doesn't go on the fiddle. Make sure to use a high impedance cord and preferably short, say 3 feet cord. The capacitance of a guitar cord heavily loads a piezo pickup reducing the high frequency component of the fiddle sound and distorting the waveform. The impedance of the piezo's are around 1 to 2 megohms. Looking on an oscilloscope I found that a guitar cable and amp input made the normal sawtooth violin waveform into peak like mountains. We are now using a short cord (2.5 feet) into a Line6 X2 wireless digital body pack. The link transmits the wave undistorted.

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Sound is distorted at certain frequency / volume what would cause this?


More infornation is required to provide a real answer, but I can give you a few possibilities:

1) There is a problem within the feedback loop that is allowing some frequencies through. This will be more prevelant at higher volume levels.

2) If there is a tube pre-amp section, the tube can be "microphonic". This too is generally more likely at higher volume levels.

3) Defective components in the amp section. These may pass some DC voltages that will sound like distortion.

If you can, please experiment a little to try to find when the problem is most obvious. With more details about when the problem occurs may give us enough info to determine the cause. Otherwise a trip to a service shop that has access to test equipment will be required.

Dan

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I get a distorted sound from my speakers throug a Phonic Helix Board. It is connected on a PC through Fire Wire. The distortion is also there while using microphones or other inputs (CD-players etc.). It...


Hallo landgenoot ;)

It seems it is a power supply problem; distorted sound, no meters, solo buttons not working, headphones low level and distorted. One of the power supply voltages might be too low or even missing. The Helix series mixers use mainly 4 supply voltages: + 15 V and - 15 V for the analog part (audio), + 5 V for the DSP and logic and +48 V only for the phantom power. If for example the + or - 15 V is too low, clipping of the positive or negative parts of the waveform (dependng on which voltage is too low) will occur. If possible, first measure the voltages coming out of the power supply. You could use a metal part of a jack as ground reference.
For the FireWire board an extra voltage supplied by the switched PSU is used. It is specified as +12,2 V, but I measured 14 V. This voltage is lowered to + 5 V by a resistor on the FW board and a 7805 regulator. (Not very efficient!) But as far as I can see, the FW voltage is not the problem here. I have some service documentation of the Helix series mixers (12, 17 and 24, so if you need more you can conatct me: frankdevries [at] versatel.nl.

Groeten, Frank.

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1 Answer

Wires to main speaker are, Yellow & Blue witch one is the positive ?. Also I am getting distortion from the clean channel even at low volume, the speaker is Peavey 1230 model 8 ohms.


Yellow should be the positive. Try plugging in and reversing. The louder of the two is the one in phase and the correct wiring. If the speaker is pushing out when playing , it is in phase and correct also.
The distortion problem could be a speaker going out. It may not be totally blown, but may be verging.
Holding your hand out as wide as you can push against the speaker lightly. If there is a rubbing or scratching sound, the speaker could be damaged.If it moves freely, and there is no scratching its okay.
Another possibility is the clean channel may have a channel volume set to high. Make sure the clean channel volume is set lower than the master volume otherwise you can get distortion on that channel too.
Good Luck.

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When i turn on my pedal i can get the clean tone but when i switch the distortion i cannot get the distorted sound...what should i do?


Make sure the pedal has the correct power supply voltage, current AND polarity.

Also adjust the setting knobs as needed.

Make sure the in's and out's are corectely connected... it will work clean if they are backward, but no distortion.

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1 Answer

Distortion of the sound of the keyboard and sometimes the sound of the key not ceasing immediately when i pull my finger off it.. ):


Likely the key contacts need to be serviced. Since you did not specify a brand or model we can;t help further other than this general info:

The contacts are USUALLY conductive rubber (black) "pills" held in silicone rubber boots that press on circuit traces on a printed circuit board under the keys.

CLEAN the pills and the circuit board with 99% isoprophyl alcohol and Q-TIPS.

There are usually two contacts per key to measure the velocity of the key. If these fail to work correctely the sounds will appear distorted and either fail to sound or will sustain abnormally.

If you are unfamiliar with electronics and handling delicate cables, you best leave the repair to a shop.

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My amp has 2 channels, clean and distortion. distortion works, but the clean channel doesnt. When i hit the button, it switches the distortion off, but there is no sound. The distortion light stays on...


initially you want to think bad solder joint, but it think its a bad mosfet or rectifier or diode. it would be hard for an untrained person to identify your problem let alone an experienced tech. it may be time to move on to another amp. in my shop it would be at least 65 bucks for the repair. so where did the "heat"/energy go from that point and what parts were affected. there may be a domino affect. burn one part, not usually.
yostamplifier.com

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