The Amplifier Research 25S1G6 is a solid-state, Class A design, selfcontained, air-cooled, broadband amplifier designed for applications where instantaneous bandwidth and high gain are required. Housed in a sfylish contemporary cabinet, the unit is designed for benchtop use, but can be removed from the ca binet for immediate equipment rack mounting. The 25S1G6, when used with a sweep generator, will provide a minimum of 25 watts of RF power. Included is a front panel gain control which permits the operator to conveniently set the desired output level. The 25S1G6 is protected from RF input overdrive by an RF input leveling circuit which controls the RF input level to the RF amplifier first stage when the RF input level is increased above 0 dBm.