B85 audio is a small, handmade effects pedal builder based in Plavsko, Czech Republic, producing overdrive, distortion, and fuzz circuits for bass and guitar. The operation handles everything in-house, including etching its own printed circuit boards, and sells primarily direct to musicians through Reverb.

The lineup draws on well-known circuit templates reworked in the builder's own enclosures. The Bass Overdrive and Hrom are CD4049UBE-based drives in the lineage of the Darkglass B3K, with Hrom adding a tone control. The Germanium Overdrive and Germanium Overdrive Deluxe are Tube Screamer 808 variants with a two-band EQ and germanium clipping diodes, while the Fuzz Machine is a hybrid silicon/germanium fuzz with a clean blend aimed at bass players. Higher-gain offerings include the Gut Ripper, a guitar distortion preamp drawn from the Wampler Triple Wreck, along with the Thunder Overdrive and the Maximizer II, which combines exciter, enhancer, and EQ stages.

B85 audio has 2 products cataloged on Equipboard, including Overdrive Effects Pedals and Fuzz Effects Pedals.