Please take a moment and thoroughly read this. Help us, help you. This is the number one call amplifier manufacturers (not just us) get from guitarists. It is very rare that the amplifier is a problem. Keep in mind that an amplifier is amplifying your signal. So if your signal suddenly drops, it means that there is less input signal for your amplifier to amplify. This is usually a sign the amp is working correctly, but something in the
You will almost always find the problem if you follow these tips.
1) Start with a stand in: Even when you feel absolutely certain, things can go bad. The first thing I recommend is to borrow or get another instrument. Intermittent or sudden volume drops come from intermittent or flaky connections and these can be inside your instruments electronics. Really, this is important and even if you are certain the guitar is good, convince yourself it isn't until you are sure it is.
2) Follow the chain: Gently wiggle the ends of the cable where the cable housing meets the flexible cable end. Work your way from the input to the amplifier and on through the entire signal chain.
2) Suspect the pedals: If you are using pedals, check each connecting cable in between on both sides all the way through to the guitar. (We have had hundreds of reports of finding the problem in the pedals over the years.)
3) Kick one out at a time: Another good measure is to take each pedal out of the chain starting with the one closest to the amp and working your way back to the guitar. If all of this is done and you still have intermittent or scratchy tones.
4) Check your speaker cable too: Check the speaker cable coming from the back of the amplifier wiggling the soft plastic where it meets the harder connector.
5) Check the speaker: Try running the amp through another speaker.
6) Check FX Loop: If the amplifier has an FX Loop then insert a known good cable from the FX Send to the FX return and when you insert them, rotate them several times to knock off any potential corrosion that may have occurred.