Unlike electric guitarists who like distortion in their amps, bass guitar players tend to go for amplifiers that are loud, clear and punchy. Though warmth from tube or valve components is at times desirable, a more common solution is a high headroom solid state amp with class A/B or the lightweight class D circuitry. Bass amps often also include more flexible and specific tone controls such as a graphic or parametric equaliser and compressors. These controls are used to notch out high frequency string noise for a more vintage mellow tone, or add punch and snap and control dynamics in a slap bass part.