... Stamford AVR (Automatic Voltage Regulator): 1. Stamford AVR, 2. Brushless, 3. Self excited. 4. Good quality and price SX460A Stamford AVR:SX460A applicable to Brushless Generator.Stamford AVR ... . Stamford AVR: AS440, MX321, MX321-A, MX341,MX341-A, SX440, SX440-A, SX440-T, SX460, SX460-A.3. Leroysomer AVR: R230, R438,R448, R449 ...