A guitar amplifier turning on but with no sound is a common problem. If you’ve been playing guitar for any length of time there’s a good chance you’ll have encountered this at some point.
Unfortunately the reason for why an amp has stopped working can be varied. Quite often it’s something obvious and that’s easily fixed. Other times it’s a bit more serious and may need a professional looking at it.
But in order to get to that point there are some simple things you can try and rule out first. And hopefully they will save you the hassle and expenses of taking your amp in to be looked over when it may not have needed it.
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Warning: if you don’t know what you’re doing don’t open up and try to fix your amplifier yourself. There is a real chance of electrocuting or causing yourself harm. Take it to someone who repairs electronics for a living.
We’re going to have to start with the silly and embarrassing reasons first because it’s important to get them out the way. You wouldn’t believe how many people find that their amp or guitar isn’t working not because of any major fault but… it’s not plugged in.
So first check to make sure your guitar is plugged in. Both ends! Is there a cable going from the guitar into the amp?
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It probably isn’t that but it happens far more frequently than you’d think and checking now might save your hours of frustration.
Again, it’s an easy mistake to make but check to make sure the amp is actually plugged in at the wall. There’s nothing worse than going through every other possibility to find you just hadn’t plugged it in!
Also if it’s a head and cabinet then make sure the cabinet is actually plugged in to the head! People unplug them and then forget.
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You’re scratching your head, it doesn’t make sense, the amp was working fine before, the power is on and.. oh, it’s still on standby.
This is another mistake that can happen very easily. You might have been in a rush or distracted and you’ve plugged your cable into the the headphone or footswitch jack rather than the input jack.
This is something to check regardless but it’s especially important if you have a new amp. It’s easy to get used to the amp you’ve had for a long time. Then when a new one arrives with a different layout of jacks you make the error when plugging your guitar in.
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It doesn’t take a lot to move the knobs on amplifiers. You could have brushed or accidentally knocked the volume control with something without realising.
Whatever the reason the volume knob being at zero can definitely make you think your amps not producing any sound when in reality there’s nothing wrong.
The guitar volume knob can also be a big culprit for an amp looking like it’s broken. Again, maybe you accidentally knocked the volume knob and it got turned down.
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Or the last time you played you had turned it down for some reason, doing volume swells or something. Even if you’re confident you didn’t it’s worth checking just in case.
Some combo amps have a wire at the back that connects the speaker to the amp. And of course a head and cabinet have a cable that connects the two.
If you’re running any pedals in front of your amp then one disconnected cable and everything will stop working. It’s so easy to miss as well.
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So either check all your pedals and make sure there’s no problems with them. Or to be completely sure bypass them entirely and just plug your guitar straight into your amp.
A notorious reason for amps not working is a faulty cable. It’s probably the most common cause when you take out the silly reasons like not having plugged it in.
Cables are prone to breaking, especially if they are old. They go through a lot of stress over time and get broken or worn.
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So try a different cable, preferably one you know is working. There’s a slim chance that the 2nd cable you try is broken too so aim to use one that you know has been working recently.
If you have a 2nd (or 3rd, or 4th…) then try a different guitar with your amp. If you don’t have any other guitars maybe try borrowing one from a friend.
Alternatively, if you have access to one, try the same guitar on another amp. If that one doesn’t work either then it’s very likely to be the guitar, and if it does you know it’s the amp.
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Try another wall socket somewhere else in your house, rehearsal space or wherever your amp is located. Anywhere it’s a different circuit so you’re checking to make sure it isn’t the source of power that is the issue rather than the amp itself.
If your amp has a headphone jack then grab a pair and try them with it. Getting sound through the headphones but not though the amp/speakers? That could be a wire has come loose to the speakers.
Alternatively it could be that headphone jack is broken. Basically the amp believes there is always headphones plugged in which is why it’s cutting off the signal to the speakers.
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Head and speaker cabinets work better if they have the correct and matching impedance (ohms), especially if it’s a tube amp. Make sure your amp and speakers are either matching or the amp has a lower ohms that the speaker: 8-ohm speaker and 4-ohm amp, for example.
If you’re using a tube amp then one of the main reasons they stop working is a broken or bad tube. It comes with the territory and happens all the time.
Diagnosing it yourself can be tricky if you don’t know what you’re doing or looking for. A quick few things you can check in daily are:
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Unfortunately by this point you’ve exhausted most of the basic things you can do. I wouldn’t recommend trying to open it up or fiddle with the components inside.
Not least because it might not be safe if you don’t know what you’re doing – electronics aren’t things to be messed about with if you’re an amateur. But also you could do some serious damage to your amp that costs you more in the long run.
I'm Andy and I've been crazy about music, and specifically the guitar, for longer than I can remember. It's this passion and enthusiasm about all things guitar that drove me to start this website. A place where I could talk about the gear, techniques and general awesomeness that is the best instrument. I began playing somewhat late compared to a lot of people. I was 15 years old as it had taken me a while to find the confidence to believe in myself and take that step to learn to play an instrument. It started my lifelong love of music and playing in general. Since then like so many before me I've become an addict and gone through more guitars, amps and gear than I care to remember. Guitar Inside Out is my way of sharing that love and passion with the music community and hopefully inspiring and helping others to enjoy it as much as I do. Learn more about AndyIf your amp makes no sound, it is first important to define what you mean by “no sound.” To that end, the first test you should perform is whether you can hear anything coming from the speakers. (This is, of course, after you have eliminated the possibility of trivial problems.)
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Listening to what (if anything) comes out of the speakers can help you isolate the problem to specific parts of the circuit. If you hear no sound coming from the speakers — including hum, hiss, reverb crash, input cable pop, or any other incidental, non-musical sounds — the problem could be the speaker itself. But, if you hear non-audio sound coming from the speakers, the problem is
Audio amplifiers, and tube amplifiers in particular, contain high voltages. Do not attempt to repair an amplifier without following the appropriate safety protocols. This includes (but is not limited to) discharging the electrolytic capacitors if you are troubleshooting the circuit within the amp chassis. Note that electrolytic capacitors can pose a shock hazard even in the amp is turned off and unplugged.
If there is absolutely nothing coming from the speakers, you should distinguish between an amplifier that is not turning on and an amplifier that is not passing signal. If you see tube glow and the pilot light is on, that is an indicator that the early power supply is functioning correctly (i.e., your amp turns on). If you don’t see these things, you should read the guide My amp doesn’t turn on first.
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Usually, in a no-sound scenario, you will hear some sound coming from the speakers, even if the signal path happens to be cut off. For instance, you may hear hum, hiss, reverb crash (if applicable), or even popping sounds when connecting or disconnecting inputs. This is because, in many cases, the signal is interrupted well
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