Uh oh made a bad bad

[LP Hovercraft]

I am housing a Ross Phase shifter (modded for 24 stages), a Corral Chorus and an Electric mistress in the same box.  I am running the chorus and the phaser's power off the GGG ultra clean LM317T based supply (tested and good 9.3 V).  Feeding that is a 21V 1Amp center tapped transformer.  The Electric Mistress is tapping power right before the ultra clean's transformer input (21V AC).  The transformer's center tap goes to the ground point of the electric mistress board.  I plugged all 3 in as described and popped the protection fuse on the mains input.  Brilliant!!!  Is what's wrong here the fact that I am using the center tap to go to the Electric mistress?  Should I instead just ground that point to the box?  Or even use a seperate transformer in there for the Mistress?  Your help will contribute to my safety and well-being right now.  Thanks!