The RCA OC3 (VR105) vacuum tube is a classic gas-filled voltage regulator designed to deliver stable, consistent 105V output in vintage electronic circuits. Known for its reliability and distinctive purple glow when in operation, this tube is a favourite among collectors, restorers, and audio enthusiasts working with classic radio, test equipment, and valve-based gear.

Manufactured by RCA during the golden age of American tube production, the OC3 is built to exacting standards, offering dependable performance and long service life. Its role as a voltage regulator makes it essential for maintaining circuit stability, helping protect sensitive components and ensuring optimal operation in high-voltage applications.

Whether you’re restoring vintage equipment, maintaining classic hi-fi systems, or sourcing authentic components for a period-correct build, the RCA OC3 delivers both functionality and historical authenticity.

A must-have component for anyone serious about vintage electronics, the RCA OC3 combines practical performance with timeless appeal.