This Linear amp was built in 2003 and puts out 1500 Watts with 57 Watts of drive. It has two microcontrollers in the control loop. One provides a 3 minute delay for the High Voltage and the other a 3 second step start for the Filament. It is a single bander for 20 Meters and features a Pi-L output circuit and a tuned input circuit. Vacuum relays are standard and can be modified for QSK. It runs cool and based on the plenum size adequate cooling is provided without excessive blower noise.