Square Amps is a one-person shop based in Austin, Texas, founded by Matt Richards. The company specializes in hand-built tube guitar amplifiers housed in the cabinets of authentic vintage wooden tube radios from the 1930s and 1940s, repurposing the original chassis and aesthetics into working cathode-bias guitar amps. Richards designs the circuits to accommodate a range of output tubes, giving each conversion its own voice and output level.

Alongside the radio conversions, Square Amps produces a small line of original amplifier designs, including the Meters Model combo and the Chippy head, both built in the vintage-inspired style that defines the brand. The shop also handles amp repair work and has expanded into drive pedal designs.

The brand has been profiled in Guitar World and Vintage Guitar magazine, which have highlighted Richards' approach of preserving the look of pre-war radio cabinetry while building point-to-point tube circuits inside. Square Amps occupies a niche corner of the boutique amp market, appealing to players drawn to low-wattage, character-driven tube tones and one-of-a-kind cabinet aesthetics.