Tank Switch Settings Kee Games, 1974 Only these adjustments should be made on circuit board 1. 1) Master volume: Look in upper right area of board. There is a small tab on each of the pots. When the two tabs are set to the same point, the volume for both tanks will be the same. 2) Missile firing and explosion sound: Look in the upper left area of the board. There are two pots here as well. Setting the tabs to the same point will set the volume evenly between the two tanks. 3) Game time: There is only one switch located on circuit board 1. Next to this switch is the pot that adjusts game time. This pot is preset at the factory: switch in the $0.25 position, one game costs a quarter and will last 60 seconds. With the switch in the $0.50 position, one game costs two quarters and will last 120 seconds. The pot can be used to fine tune the time. Do not attempt to adjust any other pots on these boards, as they are factory adjustments and tampering with them may have detrimental effects upon the game.