When I turn on my marshall amp it makes a strange sound which resembles a small motor. it has only started making this sound recently, before now the amp was silent. the sound on the amp is good but it just makes this weird noise. can you help me?
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Make sure your guitar cannot "hear" the amp as the guitar can be a pretty good microphone to cause feedback. Feedback sometimes saturates an amp and causes "squeging" which is a cycling into and out of feedback.
faulty lead? when the lead is plugged in turn the amp distortion on (may be called 'gain') and when you tap the end that goes into the guitar with your finger you should hear a buzz. try another lead if not, and if it still doesn't work make sure that volume is up on the amp and the guitar. there may also be a knob in the back of the amp, turn that up too (but not all the way or when you do get it working you'll blow the speakers out).
First make sure your guitar can't "hear" the amp as the sound can rattle the strings and have a form of feedback. Stand with your back toward the amp for example. If that doesn't help, take your guitar to the dealer and try it on another of the same type... see if it does the same. Also where you use it, make sure nothing is rattling in the area that can fool you as to how it sounds...
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.
I have fixed so many of these amps over the years... Marshall Valvestate series of amps are notorious for dry solder joints developing on the main PCB. If you have the skills(or an old mate that does)Remove the PCB from the chassis and resolder any suspect dry joints and you will fix the problem. Check particularly about any components there the PB has changed colour. This is an indication of heat in that area, and heating and cooling is a major cause dry joints. I am more than happy to answer
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When I turn on my marshall amplifier its makes this unusual, anoying sound. it sounds like a small motor or a fan going. the sound of the amp is good but its just makes this motor sound when I switch it on. can you help me find the problem.