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My amp has no volume unless turned all the way up and only on the high input jack

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Check the "Gain" on the instrument you are plugging in ... if it is all the way down, that's the problem. If that's not it, check for a "Gain" control on the amp itself -- the is a volume control that takes care of the sound BEFORE it goes through the amp (pre-distortion etc.). Sometimes this is not with all of the other controls on the amp, so look carefully.
If it is not the gain on your instrument, and it is not the gain on the amp, then make sure you are not using too long of a wire to connect the two things. If you are using a 100ft cord to connect a guitar to an amp, there will be a lot of signal degradation in the wire, and it will be hard to get good volume from the amp since it is not getting enough signal to amplify.Try a shorter cord, and that might help ...
If all of these have failed, check the fuses on your amp. If there is a blown fuse anywhere, then your amp might not be getting the full power that it needs to produce the sound you are looking for (though a blown fuse usually cuts out ALL power through the amp, some models are built differently and this could cause your issue)
If none of these solutions work, try hooking the amp up to something else that you know works fine, to make sure it is the amp itself, not what you are hooking into it, that is not working right.
If all of this turns out to be an Epic Fail ... try speaking with customer service at the amp's manufacturer ... it might be a defect that they have seen before, and they may replace it, or at least give you a better solution that what I have done.

Posted on May 24, 2011

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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.

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Also the insert jack contacts that forward the preamp to the power amp if no external FX are used can go bad.

Additional things are circuit board cracks caused by rough handling and also controls that have had the knobs mashed in which can destroy the potentiometers they are connected to.

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