The Svetlana TM SV83 is a miniature glass-envelope power pentode intended for use as a driver or output device in high-quality audio amplifiers. Features include plate dissipation 12 watts; low distortion; high transconductance; internally shielded for low hum pickup; and pinout compatible - EL84 can be used in an SV83 circuit without modification. The highly linear SV83 is similar to the EL84 with the exception of basing connections and screen-grid ratings.
Technical Bulletin: Using the SV83 in EL84 Amplifiers
Technical Bulletin: A High-Performance Mu Stage Using the Svetlana 6N1P and SV83