Balls Effects is a handmade effects and amplifier builder based in Brooklyn, New York, founded and operated by Tony Balls (the brand's name derives from his long-running nickname, Dr. Tony Balls). The shop takes a boutique, one-person approach: pedals and amps are built by hand with point-to-point wiring and hard-mounted pots, jacks, and switches rather than PCB-mounted hardware.

The lineup spans boost, distortion, fuzz, and modulation circuits, with pedals such as the Ballsmaster boost, the Black Balls, Super Black, Royale, Professor, and Pink Balls drive/distortion units, the Ambassador, Little Big, Galaxian, and Big Balls fuzzes, and modulation boxes including the Opticomp, Oscillationist, Satellite, and Neutron. Tony also builds guitar amplifiers and takes on custom one-off commissions, including unusual utility and noise boxes like the Gristlebox.

The brand has a reputation in the boutique and experimental pedal community for old-school designs executed to durable, gig-ready standards, with work going out to touring musicians, studios, and hobbyists in the US and abroad.

Balls Effects has 2 products cataloged on Equipboard, including Overdrive Effects Pedals and Fuzz Effects Pedals. Their gear is featured by 3 artists, with the strongest followings in Rock. Notable users include Rivers Cuomo, Brian Bell, and James Petralli.