grey wire from output xformer
xlr out socket
600 ohm resistors 3w common
blue wire from output xformer connects to both common and xlr out pin 3
note : it is best to twist the output wires from the transformer to the atternuator. solder them to the attenuator . then use a lenght of shielded 2 conductor wire . clip the shield wire on the atternuator side . connect this to the xlr socket , ground the shield wire on the xlr sock side .