Balthazar Audio Systems is a boutique amplifier company based in Chicago, Illinois, founded by Balthazar de Ley, a veteran studio technician for the Smashing Pumpkins. De Ley began building amps in 2017 after becoming fascinated with rare British amplifiers from the 1950s and '60s, particularly the Selmer Truevoice series. All Balthazar amplifiers are handwired using turret board and point-to-point construction with high-quality components including Classic Tone and Hammond transformers.

The company's flagship is the Film Noir 50, a 50-watt EL34-powered head inspired by the Selmer Truevoice Treble 'N' Bass 50 — the amp Syd Barrett used on Pink Floyd's Piper at the Gates of Dawn. The Film Noir 50 earned a Premier Guitar Premier Gear award and was named a "Gear of the Year" contender. The lineup also includes the Film Noir 18 combo, the Cabaret 13 (a 13-watt EL84 combo loosely based on the Vox Cambridge), and the Cabaret Mk2 series, which adds all-tube spring reverb and bias tremolo in 15-watt combo, head, and extension cabinet configurations.

Balthazar amps are designed as responsive pedal platforms, transitioning from clean jangle to raw crunch based on pick dynamics and guitar volume. The company sells through select dealers including Chicago Music Exchange, Make'n Music, and Black Bobbin.

Balthazar Audio Systems has 4 products cataloged on Equipboard, including Combo Guitar Amplifiers, Guitar Amplifier Heads, and Guitar Amplifier Cabinets. Their gear is featured by 1 artist, with the strongest followings in Pop. Notable users include Colin Sipos.