Question about Marshall Amplification Marshall AS100D 2x8 Acoustic Combo Amp

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I want to take a Marshall AS100D guitar amp and a Vox AC30 CCH guitar tube amp and a Vox Tonelab tube effects unit from USA to Zimbabwe. I intend to use a step-up/step-down transformer regulator in order to obtain 120V from the existing power there, but the frequency would still be 50Hz as opposed to the 60Hz listed on each of my amps. Question: will I have problems or risk damage to the amps at 50Hz?

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Your amps will be fine at 50Hz.... just make sure to use a transformer type and not one of those appliance types for hair dryer... the transformer type are heavy.

Here is example: http://www.voltage-converter-transformers.com/step-up-down-transformer.html#vt1000-stepup/downtransformers

Posted on Mar 30, 2011

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2 Answers

Marshall mg102fx cuts out


Hello,

I've seen a bunch of Marshall Combos and a very common failure comes from broken resistor legs at pre-amp and power amp modules insides, they are the low-value/2-3W rated and the soldered legs broke so easy because of enclosure vibrations, let me know a bit more to improve help...

Nov 04, 2013 | Marshall Amplification Marshall JMD1...

1 Answer

I have a vox valvetronic 50, which keeps blowing fuses as soon as it is switched on and leaves a burning smell. any ideas?


One or more parts in the power supply section is defective. I would recommend taking/sending the unit to a repair depot.

Oct 20, 2013 | VOX Amplification Vox VT30 Valvetronix...

2 Answers

Low volume on my marshall


I am very new here and don't know how to answer a question to a specific problem so I will write about the most common problems that I have had over the decades doing guitar amp repairs. If you find that your amp is extremely low in volume and then suddenly comes back to normal- check out the effects return [or power amp in] jack. Especially in Marshall amps-these corrode and your signal dies. If there is loud noise such as hissing and crackling with no guitar patch cord in the input jack- the input jack is likely at fault. They normally have switching contacts that ground part of the input circuit when the 1/4 inch male plug is disconnected. When this in is corroded or too weak to make normal contact, you can get these symptoms. If your amp is a solid state Marshall or Fender and there is a random buzzing sound with no guitar signal connected- hit the side of the amp and listen for the buzz to go away or become louder-if it does, this usually means that the connections are loose at the two large filter capacitors. In one or more Marshall amps, they use a filter circuit in the low voltage power supple for the preamp tubes. If you encounter a dead Marshall[the model escapes me now] remove the circuit board and resolder the four connections at the bottom of the bridge rectifier. If you have any other amplifier repair questions you can email me direct at computerlen@hotmail.com.

Nov 14, 2011 | Marshall Mg100dfx 100-Watt Combo Guitar...

1 Answer

The treble on the equalizer doesn't seem to be working. The eq seems to have lost something. No depth to the sound. I've recently had it serviced but hasn't helped. Its lost its warm bright feel cheers


I had the same issue with my AS100D. When I first bought it the treble knob on the top channel was very responsive. At 10 is was unbearably "trebley". I was getting plenty of "high" treble set at 2:00, even 1:00. Then after about 6-7 mo, I started to feel it the brightness was leaving the amp. I was now putting my treble knob all the way to 10 and keeping it there, and it still wasn't enough. I had it serviced twice, no solution. Marshall got into the act and after months of going back and forth, they finally replaced the whole amp with a new one. I just got it. The treble was incredibly bright at 10, just like the former unit. But now after just a couple of days, I can already see the treble knob is not as responsive. I can't believe it! Now what?

Apr 07, 2011 | Marshall Amplification Marshall AS100D 2x8...

1 Answer

I run a pod HD 500 into the amp and It breaks up, like there is a blown speaker sometimes.


The Marshall is a super clean acoustic amp.

The POD is overloading the amp.

Try the electric guitar input and keep the gain on the amp down, keep the EQ level and use the POD and the end volume to adjust the final volume.

The normal inputs is for a low output acoustic pickup - the POD is a high output electronic source.

Start with the Marshall gains low and get the clean sound good, then work on the gritty sound.

The amp is voiced for a sweet clean sound - if you want grit'n'ball change to a 50w Marshall valve head and a 4 X 12 cabinet.

Horses for courses

Mar 07, 2011 | Marshall Amplification Marshall AS100D 2x8...

3 Answers

I got a Marshall MG100HFX Amplifier for guitar. The problem is that whenever i turn treble switch on it gives clean sound as it should, but in couple seconds it fades away. When I turn the switch again it...


I haven't played or worked on a MG100HFX but I understand amp circuits very well. The behavior you are describing sounds to me like a bad capacitor in the Treble circuit. This is a problem that would require the skills of an experienced amp tech. If you are within your warranty period you might want to return it. If not, a good local repair shop should be able to diagnose the problem.

Good luck and keep rockin'!

Mar 01, 2011 | Marshall Amplification Marshall MG100HFX...

1 Answer

I just replaced the fuse with a lesser fuse now the amp just hums. The pots are all on low and it does this with or without a instrument plugged in


This is likely a power supply problem such as a bad filter capacitor. If the fuse blew before, probably one of the rectifiers blew due to a shorted capacitor followed by one or more diodes failing.
Take unit in for repair unless you are adept at electronics.

Dec 01, 2010 | Marshall Amplification Marshall AS100D 2x8...

1 Answer

Hiwhat is the best way to connect my DigiTech RP10 to my Marshall MA100H Guitar Amplifier


Read your manuals for both pieces of gear carefully first. You only have one amp so you won't be able to take advantage of all the FX on the Digitech as a lot of them are designed for stereo. The Digitech manual shows guitar into the Digitech and output from the Digitech into input of any guitar amp. Since you have a Marshall and can already get some great sounds by running your guitar straight into the Marshalls input, you would probably be better off using your Digitech in the FX loop. Run a guitar cord out of the send on the loop into the input of the Digitech and a guitar cord out of the left / mono output jack on the Digitech into the effects return jack on the Marshall. Start out with the effects level on the Marshall all the way down. Do the same with the Digitech with both the input and output levels. (Read the manual carefully) I think the choice of the Digitech isn't that great because it is already trying to reproduce a lot of what you can already get with just your Marshall but with a little experimentation and some careful adjustments you should be able to add to the sound of the Marshall. Hope this helps.

Oct 23, 2010 | Marshall MG100HDFX 100-Watt Amplifier Head

2 Answers

Marshall DSL 100 - volume fades away and gradually comes back on


IF this is a vacuum tube unit, these symptoms are that of a tube that the heater is intermittent, that is it cools off due to a break and then liights again.

Open the back and observe the heaters in the tubes. DO NOT be fooled by some that have TWO heaters in them. (use a mirror if necessary) A single one that comes and goes can cause the problem and the voiration can make it come and go. This behavior in a tube is NOT somthing readily spotted in a tube checker. The delay in fading and coming back would be the delay in warm up following a heater going out and cooling.

Feb 14, 2010 | Marshall Amplification Marshall MG250DFX...

1 Answer

Marshall VS65R is powered up it hums


Blown speaker NO (would not get sound at all)

Bad Reverb UNLIKELY (controls would deselect reverb and it would be out of circuit)

Bad preamp tube NO (controls have no effect)

Bad rectifier and/or filter caps LIKELY

Bad power amp POSSIBLE

Nov 29, 2009 | Marshall Mg50dfx 50-Watt Combo Guitar...

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