[Chad Hauris]

All of the Zenith sets("AC/DC" and some sets which use a plate voltage transformer and still have series filaments) which contain an interlock on the power cord have one side of the power line connected to the chassis. I would not recommend powering up these chassis outside the cabinet unless an isolation transformer is used, You can potentially get shocked from the neutral of the powerline as sometimes it will carry current.

On the earlier Zenith models which have the interlock female end attached to the back cover I have replaced the old cord with a polarized power cord with the neutral connected to the prong going to the chassis.