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Re: my tone knob given that it's no more fixed to the...
There should be the nut that's been mentioned as well as a chrome flat washer under the knob. In side the guitar cavity, there should also be a toothed lock washer around the pot shaft against the guitar top. if these are missing, that will let the knob slip around. Most decent guitar stores or repair shops will sell you these parts.
Re: my tone knob given that it's no more fixed to the...
Ray's answer is correct.
If you pry the plastic knob straight up off of the tone pot shaft, you should see the retaining nut.
I would usually take the time to open up the plastic cover on the back of the gutar first, to make sure that the wires haven't been twisted around too badly, since the pot has been moving around, to align it to the proper position before re-tightening the nut.
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the switch, has three positions. Typically forward or up will be your neck (or rythm) pick ups, only and will work with one volume knob(usually top right as your looking at guitar), and one tone knob ( top left as your looking at the guitar). when the switch is in the far right or all the way down position, that will be the saddle (or lead) pick-ups. And that works with only one volume knob(bottom right as your looking at the guitar) and the corresponding tone knob. when the switch is in the middle position, botjh volume knobs work and both tone knobs work. You've gotta kinda play around with them to find whatever sound yopur looking for. and tone knobs are very subtle in their changes. good luck
The one furthest from the switch is volume. The next one is a tone knob. Volume rasises or lowers the resistance and makes the guitar louder. You can also "clean up" a distorted tone by rolling off volume. Tone makes the sound more bassy or more treble.
It sounds like somehow the pre-gain is very high while the volume or post-gain is very low. Try turning the volume high on the effects unit and the gain low, and don't have the amp volume too low either.
chances are that the contacts in the pick up switch and or volume / tone controls have got dirty over time and are not making good contacts.
The 3 position toggle switches in most budget Les Paul copies are prone to failure - only making contact on one position as the springs get weaker - you could try unscrewing the back plate and examining what is happening in the switch.
Try rotating the volume and tone knobs vigourously to and fro - if this produces a crackling sound the contacts are dirty - further rotation will clean them a bit but a little squirt of switch cleaning spray will help too.
Other than that it could be dry solder joints anywhere on the back of the switches and knobs or poor contact inside the jack socket
Firstly don't panic! It might be something quite simple - and it might not actually be the amp that is at fault.. Here are a few things you can try to start with to trace the problem by systematic elimination.
If you are using any effects pedals unplug them and plug your guitar straight into the amp - does that solve it? Turn off any built in effects on the amp and unplug the foot pedal.
Try a different guitar lead - leads are very prone to failure -especially at the solder joints in the jack plugs - but sometimes in the middle as well because they get pulled a lot in use. The tiny twisted copper wires in the core of the lead can become cracked, which will increase the electrical resistance (causing the volume to drop. As you move about the bits of broken wires may touch again (reducing resistance so the volume increases again).
Check the tightness of the screw threaded rings (bezels) that hold the jack sockets on to the body of your guitar and the front panel of your amp. These can work loose over time (especially on the guitar) and cause the jack plug to only make a partial contact inside the socket with the same results as no 2 above.
On both the amp and on the guitar quickly and vigorously rotate all the volume and tone control knobs backwards and forwards (up and down) fully several times - the copper contacts inside the knobs can become oxidised over time. Doing this will clean them a bit by means of the friction between the contacts. Do this with one knob then test to see if the problem has been resolved before moving on to the next knob - that way you will be able to identify which one is faulty (you may hear some crackling as you rotate it). In the same way flick your guitar pick up selector switch backwards and forwards several times. If you find this resolves the problem you might apply a VERY little squirt of switch cleaner ( a spray that you can buy from electrical component shops like Maplin) to give the knobs / switches a more permanent cleaning - but don't overdo it and allow a few hours for any surplus to evaporate before you use the amp again. HOWEVER - don't use switch cleaner if your amp is still in manufacturers warranty AND if rotating the knobs hasn't solved the problem.
If none of the above has solved the problem then the amp itself might be faulty. Don't attempt electrical repairs yourself. Apart from the obvious danger of messing with electricity you may actually do more harm than good and without proper test equipment it is extremely unlikely you will be able to trace a faulty component. If the amp is still in warranty take it back to the shop (or phone/email them if you bought it online). If it is out of warranty your local music shop may know of a good repairer in the neighbourhood who won't rip you off (they may even have their own 'techie' who can do it for you).
There are 2 channels, Which means there are 2 sets of knobs ... One for clean and one for crunch. Start out with a low master volume and set up the crunch, Then the clen and switch between the 2 and make adjustments until they match volume wise ... Then turn the master up.
The volume is a common problem ... Search for wiring diagrams for your guitar to find a better wiring. Or take it to a guitar repair centre to have it fixed.
To tell which pickups are selected with the switch if it doesn't have the little plate telling you, Turn one volume down and flick the switch one way so you can hear just one pickup.
Two ways of telling which one it is picking up ... A toppy tone is the one nearest the bridge ... a bassy tone is the neck pickup ... The middle selection on the switch is both coils selected ... If you cant tell by tone ... Tap the pick up and you'll soon hear which one you have selected.