: A sharper, harsher sound that is a harmonic of the original signal. This often suggests problems with cables, shielding, or the power supply. 2. Common Causes of Noise
: Aging preamp or power tubes can cause crackling or volume-dependent humming. amplifier-buzzing-noise
: Internal power supply capacitors (electrolytic) that are leaking or bulging can no longer filter out AC ripple. : A sharper, harsher sound that is a
: For tube amps, tap tubes lightly with a wooden stick; a loud ringing sound indicates a microphonic tube that needs replacement. Perspectives on Grounding Safety : A sharper
Identifying the specific sound frequency is the first step in diagnosing the root cause: