Amp noise comes from a few specific places, and you fix them in order of impact. Most "my amp is noisy" problems are too much gain, single-coil hum, or a grounding/cable issue — not a broken amp.
Turn gain down first. Every point of gain multiplies hiss. If the noise only appears at high gain, that is the cause — back it off and use a boost pedal for tightness instead of cranking the amp.
Add a noise gate. A noise gate (e.g. ISP Decimator, Boss NS-2) placed after your drive pedals silences the hiss between notes without killing sustain. Essential for high-gain and metal.
Fix single-coil hum. Single-coils hum by design (60-cycle hum). Rotate so your body shields the pickups, move away from screens and dimmers, or use noiseless/humbucker-sized pickups. Humbuckers cancel this hum entirely.
Check grounding & power. A loud hum that changes when you touch the strings is a grounding problem — try a different outlet, avoid daisy-chained power, and make sure the amp and pedals share a clean ground.
Swap the cable. A cheap or failing instrument cable adds buzz and crackle. Use a good shielded cable and keep it away from power supplies.
💡 Order matters: gain down → gate → shielding → power/ground → cable. Fix the biggest cause first and you often never reach the small ones.
Why is my guitar amp so noisy?
Why is my guitar amp so noisy?
Usually too much gain, single-coil hum, or a grounding/cable fault. Lower the gain, add a noise gate after your drives, and rule out single-coil 60-cycle hum and a bad cable — in that order.