Guitar combo amps with Tremolo

Tremolo

— this term can mean two different effects, similar in sound, but not the same — tremolo itself and vibrato. Both of them provide a kind of "trembling" sound; the difference lies in what exactly "trembles". So, tremolo is a trembling sound that occurs with rapid fluctuations in volume; you can achieve a similar effect directly on the guitar by playing several short ones in a row instead of one long note (for example, 4 sixteenths instead of 1 fourth). Vibrato is the trembling that occurs when a sound fluctuates in frequency; on an instrument, a similar effect is achieved by rapidly tightening the string.

Tremolo and vibrato are similar in sound, but still not identical; so if the nuances of sound are important to you, it's ok to clarify what exactly is meant by this term in the selected model. However, on the market there are combo amplifiers with two effects at once — both Tremolo and Vibrato.