Presolicitation notice from the Department of Energy for the procurement of EIC 591 MHz RF Amplifier Systems. These systems will be used at the Electron-Ion Collider (EIC) at Brookhaven National Laboratory (BNL) in Upton, New York. The RF amplifier systems will be constructed with solid state devices and will operate in both CW and Pulsed modes. The primary mode of operation will be CW, with pulsed operation used during cavity conditioning. The operating class will be AB. The procurement includes two (2) 591MHz, 200kW RF amplifier systems and two (2) 591MHz, 400kW RF amplifier systems. The 200kW systems should be expandable to 400kW using a 2-way waveguide combiner. Both the 200kW and 400kW systems will have a common controller. For more details, refer to the attached Technical Specification.