Siegmund Guitars and Amplifiers is a small California-based boutique shop founded by builder Chris Siegmund. The shop began producing solid body and archtop electric guitars in 1994, added tube-driven effects pedals around 1999, and introduced tube guitar amplifiers in 2000. Each piece is handmade one at a time, with original designs rather than reissues of vintage circuits.

The brand is best known for its hand-wired tube guitar amplifiers. The Midnight Special, available in both head and combo form, is the longest-running model in the line — a single-ended, class A amp built around octal preamp tubes with onboard reverb and self-biasing output, designed to accept a range of rectifier and power tubes for tonal variation. The Diamond is a 25-watt amp built around a 300B output tube and octal preamp tubes, often paired with a field coil speaker and a magic eye. The Doppler is a stereo combo that splits frequencies between a 10-inch and 15-inch speaker in a V-front cabinet, using KT66 and EL34 power tubes to produce a Leslie-style rotating-speaker effect.

Alongside amplifiers, Siegmund builds custom solid body and archtop electric guitars and a small range of tube effects, generally on a one-off basis. The output sits closer to single-builder instrument making than production manufacturing, and the brand tends to circulate among players seeking boutique, hand-built gear.

Siegmund has 3 products cataloged on Equipboard, including Combo Guitar Amplifiers and Guitar Amplifier Heads. Their gear is featured by 1 artist, with the strongest followings in Rock, Pop, and Blues. Notable users include Zane Carney.