RB300

About the RB300

The Moth Audio RB-300 tonearm is essentially a Rega RB300, a well-regarded British-made tonearm known for its rigid one-piece arm tube and headshell, closely toleranced bearings, and magnetic frictionless bias compensation. It features a spring dial system for tracking force adjustment, which applies maximum negative vertical tracking force (VTF) at zero and disconnects above three grams. The arm tube is grounded via the left channel ground wire, eliminating the need for a separate earth wire. The RB-300 is praised for its tonal balance and ability to extract excellent performance from a variety of cartridges, making it a competitive option in its price range. It has an effective length of 237mm, overhang of 15mm, mounting distance of 222mm, effective mass of 11.5g, and supports cartridge weights from 4 to 11 grams. The design was updated to address platter wobble issues by adopting a Rega-style bearing/hub assembly. The RB-300 is considered a classic and influential tonearm, often compared favorably to more expensive models, though some users report mixed experiences depending on system synergy and modifications such as rewiring or counterweight upgrades.