 "Taiyō" and "Un'yō" received a total of 24 guns in eight triple mounts while "Chūyō" had a total of 22 guns plus 5 license-built Type 93 anti-aircraft machineguns.The ships also received a Type 13 early-warning radar in a retractable installation on the flight deck at that time.The following year, "Taiyō"s 12 cm guns were replaced by four 12.7 cm Type 89 guns in twin mounts.