I have an Marshall Valv 8040 and i want to use headphones can anyone tell me how to do this???

Why is there no sound when my wired headset is connected?
To check that the headphones are connected correctly and there are no loose connections, try unplugging and replugging the audio device. Make sure that the headphones are not plugged into an audio-in or microphone jack if your audio equipment has more than one headphone jack accessible.

yeah my tablet was the same
like it will only play with headphones.
Go to the store you got it from and ask about it

What type of Marshall, please?
First of all, control the fuse and let me know.

I have just fixed one of the amplifiers with this fault. It was a poor solder joint on the headphone socket. The ground of the speaker is switched through the headphone socket, so if there isn't a good connection, the speaker volume drops, but the headphone output is still OK.

plug headphone in the effects send jack...If you get somme sound (won't be too loud) there, that means preamp sections are probably ok. Drive a signal into the effects return jack... If power amp responds, it is OK... If both these are OK, then suspect the switch contacts on these two jacks that forward the preamp to the power amp when effects unit is NOT plugged in.
These contacts are a chronic problem.

There are many models of Marshal amps icluding 15Watt types.

First thing to try is to see if headphones have normal volume. If they do, then the headphone jack switch that connects the speaker is LIKELY bad.

If the headphones do not have any volume, LIKELY causes are:

1. Fried output power amp

2. Volume pot is broken or has bad solder joints to the circuit board.

Contrary to what's posted above, the Marshall MG series does not pass the speaker power output through the headphone jack, and inserting the headphones into the jack does not disable the speaker. The headphone amp is a separate circuit and it's input is taken before the master volume. So Jan's post is exactly right. Turn off the master volume and turn up all the other gain/volumes as high as they will go. The other issue is that the headphone jack's output does not drive low efficiency headphones well, so you need some headphones similar to Sony's MDR-V700s to hear it well. Earbuds just don't cut it.

Common causes:

Broken input jack.

Blown power amp chip due to overdriving.

Smashed pots due to tipping over or transportation damage.

Blown power supply due to bad power at a venue.

In some cases, grounding the headphone jack can blow amp.

There are some possibilities. One, your speaker may be blown or disconnected. Make sure the wiring is still connected to the speaker and if you have one, try measuring the resistance(impedance) of the speaker with a volt ohm meter.Do this unplugged from current and disconnect one of the wires from the speaker or you will get a reading from the output stage. Two if there is a heaphone or line out jack it may have become faulty. If you have sound with the headphones plugged in your amp is still producing sound. Some jacks are designed to interrupt the signal to the speakers allowing you to practice without bothering anyone. If your amp has that feature and you still have sound with the headphones and your speaker tests OK then your problem is the jack. Hope this helps.

Hi,

It sounds as if you need to replace the power cord or the power socket on your amplifier.
If you can get into the cord check to see if the connections are tight do the same on the socket.
I guess you have a faulty connection.

Regards
Alan Hood
ami-man
UK