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The main things to consider when choosing an amp are price, your core tone desired, versatility, reliability, and power. Most amps are designed for one or two types of tones and have a tonal signature that is difficult to find elsewhere. Outside of tweaking the controls provided on the amp itself, using boost/overdrive pedals, EQ, or other affects can be used to strongly alter the tone.
The modern amplifier generally has 2 to 4 channels that you can switch between. This will give you that many distinct tonesthat you can access on-the-fly. Some amps have completely independent controls for each channel, while some amps share some controls across channels which may make them less versatile. Beyond that, some amps have controls that affect all the channels.
== Pre-Amp vs. Power Amp ==