Small 15 and 20-watt guitars amps can be used for playing gigs in certain situations. … Something in the 40 or 50-watt range, either a combo or a head paired with a 2×12 cabinet. But, if the situation permitted it, I would prefer to use an even smaller amp to take to gigs and possibly even rehearsals.
Keeping this in view, how big an amp do I need?
Generally you should pick an amplifier that can deliver power equal to twice the speaker’s program/continuous power rating. This means that a speaker with a “nominal impedance” of 8 ohms and a program rating of 350 watts will require an amplifier that can produce 700 watts into an 8 ohm load.
Additionally, how many volts does a guitar amp use? Standard voltage can be 100, 120, or 230 volts, at 50 or 60 cycles per second.)